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acquired / Measurement period adjustment Goodwill, Measurement Period Adjustment Company Selected Measure Name Company Selected Measure Name Pro forma net income from continuing operations attributable to Greif, Inc. Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Operating lease liabilities Deferred Tax Assets, Operating Lease Liabilities Deferred Tax Assets, Operating Lease Liabilities Accounts payable Accounts Payable, Current Operating cash flows used for operating liabilities Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] 2020 Long Term Incentive Plan Restricted Stock 2020 Long Term Incentive Plan Restricted Stock [Member] 2020 Long Term Incentive Plan Restricted Stock Non-U.S. Current Foreign Tax Expense (Benefit) Goodwill [Roll Forward] Goodwill [Roll Forward] Net decrease in unrecognized tax benefits for the next 12 months Decrease in Unrecognized Tax Benefits is Reasonably Possible Net sales Disposal Group, Including Discontinued Operation, Revenue Denominator for diluted EPS (in shares) Diluted shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Other debt Other Short Term Debt [Member] Other Short Term Debt Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity Small Business Entity Small Business Ownership percent acquired Business Combination, Voting Equity Interest Acquired, Percentage Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Net income allocated to redeemable noncontrolling interests Redeemable noncontrolling interest share of income Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Schedule of Change in Projected Benefit Obligation Schedule of Changes in Projected Benefit Obligations [Table Text Block] Undistributed profits of non-U.S. subsidiaries Deferred Tax Liabilities, Undistributed Foreign Earnings State and local Current State and Local Tax Expense (Benefit) DEBT Long-Term Debt [Text Block] Document Transition Report Document Transition Report Thereafter Lessee, Liability, To Be Paid, After Year Five Lessee, Liability, To Be Paid, After Year Five Other long-term assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest, Equity [Roll Forward] Redeemable Noncontrolling Interest, Equity [Roll Forward] Total lease payments Finance Lease, Liability, to be Paid Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date INCOME TAXES Income Tax Disclosure [Text Block] Earnings per Class A common stock - basic Class A common stock Common Class A [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Total shareholders’ equity Beginning balance, value Ending balance, value Stockholders' equity Equity, Including Portion Attributable to Noncontrolling Interest Dividend proportions (in usd per share) Common Stock, Dividend Proportions, Per Share Common Stock, Dividend Proportions, Per Share Total liabilities assumed Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments, Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments, Liabilities Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] EARNINGS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Product and Service [Axis] Product and Service [Axis] Restructuring reserve, accrual release Restructuring Reserve, Accrual Adjustment Total current assets Assets, Current Purchase Price Allocation Increase intangible assets Finite-Lived Intangible Assets Acquired Statistical Measurement [Axis] Statistical Measurement [Axis] Share repurchase program, authorized, amount Share Repurchase Program, Authorized, Amount Derivative, interest rate Derivative, Fixed Interest Rate Fair Value Inputs, Assets, Quantitative Information [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Tax withholding payments for stock-based awards Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Less: interest Lease, Liability, Undiscounted Excess Amount Lease, Liability, Undiscounted Excess Amount 2005 Outside Directors Equity Award Plan Restricted Stock Two Thousand Five Outside Directors Equity Award Plan Restricted Stock [Member] Two thousand five outside directors equity award plan restricted stock. Share Repurchase Program [Domain] Share Repurchase Program [Domain] Income from discontinued operations before income tax expense and equity earnings of unconsolidated affiliates, net Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Current liabilities Liabilities, Current [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Long-term line of credit Long-Term Line of Credit Accounts payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Number of acres Business Acquisition, Area Of Acquired Property Business Acquisition, Area Of Acquired Property Earnings per common stock - diluted (in usd per share) Earnings Per Share, Diluted Trade accounts receivable, net of allowance Accounts Receivable, after Allowance for Credit Loss, Current Non-cash transactions: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Schedule of Actuarial Assumptions Used to Measure Benefit Obligations and Pension Costs Defined Benefit Plan, Assumptions [Table Text Block] Beginning balance, treasury stock (in shares) Ending balance, treasury stock (in shares) Treasury Shares (in shares) Treasury Stock, Common, Shares Consolidation Items [Domain] Consolidation Items [Domain] Net income from discontinued operations, net tax Net income from discontinued operations, net tax Net income (loss) from discontinued operations, net tax Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Basis Of Presentation And Significant Accounting Policies [Table] Basis Of Presentation And Significant Accounting Policies [Table] Basis Of Presentation And Significant Accounting Policies [Table] Auditor Location Auditor Location Schedule of Depreciation on Properties, Plants and Equipment Estimated Useful Lives Of Property Plant And Equipment [Table Text Block] Estimated useful lives of property plant and equipment table. Gross profit Gross Profit Foreign currency impact Other Comprehensive Income Foreign Currency Impact Other comprehensive income foreign currency impact. 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Total lease payments Lessee, Operating Lease, Liability, to be Paid Dividends declared to noncontrolling interests and other Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (Decrease) increase in accumulated other comprehensive loss Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Withholding taxes Effective Income Tax Rate Reconciliation Withholding Tax Effective income tax rate reconciliation withholding tax. Expiration Date Trading Arrangement Expiration Date Increase in gross intangible assets Gross Intangible Assets, Period Increase (Decrease) Gross Intangible Assets, Period Increase (Decrease) Future amortization expense, 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Five Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Other reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Properties, plants and equipment, net Property, Plant and Equipment, Net The Business Business Description [Policy Text Block] Business description. Costs incurred and charged to expense Amounts Incurred During the Eleven Months ended September 30, 2025 Restructuring Charges Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Trade accounts receivable Increase (Decrease) in Accounts Receivable Realized gains (losses) recorded under fair value contracts Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives Inventory Inventory, Policy [Policy Text Block] Restructuring Cost [Table] Restructuring Cost [Table] Entity Current Reporting Status Entity Current Reporting Status Secured Term Loan A-2 Facility Secured Term Loan A-2 Facility [Member] Secured Term Loan A-2 Facility [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Auditor Information [Abstract] Auditor Information [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] State and local taxes, net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Current portion of finance lease liabilities Finance Lease, Liability, Current Accumulated benefit obligation Defined Benefit Plan, Accumulated Benefit Obligation Inventory valuation reserves Inventory Valuation Reserves Proceeds from issuance of long-term debt Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Other current liabilities Business Combination, Recognized Liability Assumed, Other Liability, Current Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Segment recast Goodwill, Transfers Liabilities Derivative Liability Total properties, plants and equipment, net Property, Plant and Equipment, Net, Including Leases Property, Plant and Equipment, Net, Including Leases Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Net prior service cost amortized Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax International Trade Accounts Receivable Credit Facilities International Trade Accounts Receivable Credit Facilities [Member] International Trade Accounts Receivable Credit Facilities [Member] Liability (gain) loss Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Minimum Pension Liability, before Tax Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Minimum Pension Liability, before Tax Lump sum payments Defined Benefit Plan, Cash Settlements, Benefit Obligation Defined Benefit Plan, Cash Settlements, Benefit Obligation REDEEMABLE NONCONTROLLING INTERESTS Noncontrolling Interest Disclosure [Text Block] Schedule of Recurring Fair Value Measurements Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Balance of unrecognized tax benefit at beginning of year Balance of unrecognized tax benefit at end of year Unrecognized Tax Benefits Total identifiable net assets Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Site Contingency [Line Items] Site Contingency [Line Items] Denominator for diluted EPS – Weighted Average Number of Shares Outstanding, Diluted [Abstract] Delta Petroleum Company, Inc. Delta Petroleum Company, Inc. [Member] Delta Petroleum Company, Inc. Annual maturities, long-term debt, 2027 Long-Term Debt, Maturity, Year Two LEASES Lessee, Operating Leases [Text Block] Gain on disposal of properties, plants and equipment, net Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property, Continuing Operations Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property, Continuing Operations Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Restricted stock, directors Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Long-term deferred tax liability Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Liability Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Liability Costs of products sold Cost of Product and Service Sold Disposal Group Classification [Domain] Disposal Group Classification [Domain] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Increase or (decrease) in accumulated other comprehensive loss Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Risk-Free Rate at Valuation Date Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Interest rate Derivative, Forward Interest Rate Entity Tax Identification Number Entity Tax Identification Number Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent Expenses paid from assets Defined Benefit Plan Expenses Paid Defined benefit plan expenses paid. Schedule of Reconciliation of Shares Used to Calculate Basic and Diluted Earnings Per Share Schedule of Weighted Average Number of Shares [Table Text Block] Issued Shares (in shares) Common Stock, Shares, Issued Write-off of fully amortized assets Amortization of Intangible Assets, Write-off Amortization of Intangible Assets, Write-off Schedule of Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest [Table Text Block] GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Components Of Net Periodic Pension Cost Components Of Net Periodic Pension Cost [Table Text Block] Components Of Net Periodic Pension Cost Dividends payable Dividends Payable, Current Entity Public Float Entity Public Float Schedule of Changes in Carrying Amount of Goodwill by Segment Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Basic earnings per share from continuing operations attributable to Greif, Inc. common shareholders (in usd per share) Business Combination, Pro Forma Information, Pro Forma Earnings Per Share, Basic Goodwill Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent Unrecognized net actuarial loss Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Corporate and other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Total long-term liabilities Liabilities, Noncurrent Durable Metal Solutions Durable Metal Solutions Segment [Member] Durable Metal Solutions Segment Capital expenditures included in accounts payable Capital Expenditures Incurred but Not yet Paid Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Share repurchases (in shares) Stock Repurchased During Period, Shares Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Prepaid expenses Prepaid Expense, Current Other current liabilities Other Liabilities, Current Plan participant contributions Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Phantom Share Units (PSUs) Phantom Share Units (PSUs) [Member] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Share based compensation Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture Sustainable Fiber Solutions Paper Packaging And Services [Member] Paper packaging. Statement [Line Items] Statement [Line Items] Schedule of Reconciliation of Beginning and Ended Restructuring Reserve Balances Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Inventories Disposal Group, Including Discontinued Operation, Inventory, Current Timber properties, net of depletion Timber and Timberlands Indicative Bids Broker Quote Or Indicative Bids Valuation Technique [Member] Broker Quote Or Indicative Bids Valuation Technique [Member] Other Intangibles Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Finance Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Net increase in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Assumed conversion of stock options and unvested shares (shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Statistical Measurement [Domain] Statistical Measurement [Domain] Properties, plants and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Total properties, plants and equipment, net from discontinued operations Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Foreign Plan Foreign Plan [Member] Payables net, related to investments Receivables (Payables) Net, Related to Investments Receivables (Payables) Net, Related to Investments Restructuring and other charges Restructuring and other charges Restructuring Charges And Other Restructuring Charges And Other Domestic Line of Credit Domestic Line of Credit [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Interest rate derivatives Interest Rate Swap [Member] Basis Of Presentation And Significant Accounting Policies [Line Items] Basis Of Presentation And Significant Accounting Policies [Line Items] Basis Of Presentation And Significant Accounting Policies [Line Items] Equity earnings of unconsolidated affiliates, net of tax Equity earnings of unconsolidated affiliates, net of tax Income (Loss) from Equity Method Investments Leases [Abstract] Leases [Abstract] Increases in tax positions for prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Basic earnings per share attributable to Greif, Inc. common shareholders: EPS Basic Earnings Per Share, Basic [Abstract] Operating Activities [Axis] Operating Activities [Axis] Accounts payable Increase (Decrease) in Accounts Payable Schedule of Disposal Groups, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Type of Restructuring [Domain] Type of Restructuring [Domain] Interest expense, net Gains recorded in interest expense Interest expense, net Interest Income (Expense), Nonoperating Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Number of plants closed Number Of Plants Closed Number of plants closed. Acquisitions of companies, net of cash acquired Payments To Acquire Business, Net Of Cash Acquired, Current Acquisitions Payments To Acquire Business, Net Of Cash Acquired, Current Acquisitions Earnings per common stock - basic (in usd per share) Earnings Per Share, Basic Net investment hedge, gain before reclassification and tax Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax Vested former employees and deferred members Vested Former Employees Numerous Defined Benefit Pension Plans Vested former employees numerous defined benefit pension plans. Plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Total deferred tax assets Deferred Tax Assets, Gross Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax Schedule of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of interest and income taxes paid: Supplemental Cash Flow Information, Interest And Taxes [Abstract] Supplemental Cash Flow Information, Interest And Taxes [Abstract] Common stock (discontinued operations) - diluted (in usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Short-term borrowings Short-Term Debt Timberland transactions Deferred Tax Liabilities Timberland Transactions Deferred tax liabilities timberland transactions. Multicurrency Facility Multicurrency Facility [Member] Multicurrency Facility [Member] 2028 Finance Lease, Liability, to be Paid, Year Three Indefinite-Lived Intangible Assets [Line Items] Indefinite-Lived Intangible Assets [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Share based compensation expense Share-Based Payment Arrangement, Expense Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Current assets Assets, Current [Abstract] Total liabilities and shareholders’ equity Liabilities and Equity Currency Translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Other Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change Minimum Pension Liability Adjustment Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Minimum pension liability adjustment, income tax expense Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax Finance leases Lessee, Finance Lease, Discount Rate Other Deferred Tax Assets, Other Common stock Defined Benefit Plan, Equity Securities, Common Stock [Member] Total capital expenditures Segment, Expenditure, Addition to Long-Lived Assets Active participants Active Participants In Numerous Defined Benefit Pension Plans Active participants in numerous defined benefit pension plans. Schedule of Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Treasury Stock Treasury Stock, Common [Member] Net income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Pay vs Performance Disclosure [Line Items] Lease liabilities Operating Lease, Liability Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Finance lease cost - amortization Finance Lease, Right-of-Use Asset, Amortization Acquisition of redeemable shareholder interest Noncontrolling Interest, Increase from Business Combination Other adjustments Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Other Adjustments Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Other Adjustments Other long-term liabilities Other Liabilities, Noncurrent Site Contingency [Table] Site Contingency [Table] Purchases of redeemable and mandatorily redeemable noncontrolling interest Payments for Repurchase of Redeemable Noncontrolling Interest Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Current portion of long-term debt Less current portion Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Intercompany Sales, Recycled Fiber Intercompany Sales, Recycled Fiber [Member] Intercompany Sales, Recycled Fiber Comprehensive income attributable to Greif, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Schedule of Provision for Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Percentage of shares outstanding used in two class method calculation Percentage Of Shares Outstanding Used In Two Class Method Calculation Percentage of shares outstanding used in two class method calculation. Term Loan Secured Debt [Member] Class of Stock [Line Items] Class of Stock [Line Items] Deferred tax liabilities Deferred Income Tax Liabilities, Net Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Net income from discontinued operations attributable to Greif, Inc. Net income from discontinued operations attributable to Greif, Inc. Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Revision of Prior Period, Adjustment Revision of Prior Period, Adjustment [Member] Long-term debt Long-Term Debt Total assets Total assets Assets Schedule of Nonvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Future amortization expense, 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Greif Containerboard Solutions, LLC Greif Containerboard Solutions, LLC [Member] Greif Containerboard Solutions, LLC Minimum pension liabilities Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Geographical [Domain] Geographical [Domain] Income Taxes Income Tax, Policy [Policy Text Block] Finance leases Lessee, Finance Lease, Term of Contract Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Receivable Type [Axis] Receivable Type [Axis] 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Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Leased assets obtained in exchange for new lease liabilities: Lease, Cost [Abstract] Pension and post-retirement benefit liabilities Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Total assets acquired Business Combination, Recognized Asset Acquired, Asset Level 2 Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Defined Benefit Plan, Changes in Accumulated Other Comprehensive (Income) Loss [Roll Forward] Defined Benefit Plan, Changes in Accumulated Other Comprehensive (Income) Loss [Roll Forward] Defined Benefit Plan, Changes in Accumulated Other Comprehensive (Income) Loss [Roll Forward] Operating Leases Lessee, 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Income Taxes, Noncontrolling Interest United States United States UNITED STATES Increase (decrease) in cash from changes in certain assets and liabilities, net of impacts from acquisitions: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Properties, plants and equipment Deferred Tax Liabilities, Property, Plant and Equipment Estimated Volatility at Valuation Date Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Retained Earnings Retained Earnings [Member] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Schedule of Quarterly Results of Operations Quarterly Financial Information [Table Text Block] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Assets Derivative Asset Finance lease liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finance Lease Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finance Lease Liabilities Product and Service [Domain] Product and Service [Domain] Weighted-average discount rate: Weighted-Average Discount Rate [Abstract] Weighted-Average Discount Rate 2027 Lease, Liability, to be Paid, Year Two Lease, Liability, to be Paid, Year Two Common stock (continued operations) - diluted (in usd per share) Income (Loss) from Continuing Operations, Per Diluted Share Greif, Inc. 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