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Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Weighted Average Common Shares Outstanding: Weighted Average Common Shares Outstanding [Abstract] No definition available. Weighted Average Exercise Price Share Based Compensation Arrangement By Share Based Payment Award Stock Settled Stock Appreciation Rights Outstanding Weighted Average Exercise Price [Roll Forward] Share Based Compensation Arrangement By Share Based Payment Award, Stock Settled Stock Appreciation Rights, Outstanding, Weighted Average Exercise Price [Roll Forward] Current liabilities Business Combination, Recognized Liability Assumed, Liability, Current Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Other Noncurrent Assets [Member] Other Noncurrent Assets [Member] Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Tabular List, Table Tabular List [Table Text Block] Leases [Abstract] Leases [Abstract] Schedule Of Other Noncurrent Liabilities Other Noncurrent Liabilities [Table Text Block] Recent Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Company-Sponsored Plans [Member] Company-Sponsored Plans [Member] Company-Sponsored Plans [Member] Machinery and equipment Machinery and Equipment, Gross Income Tax Authority [Table] Income Tax Authority [Table] Income Tax Authority [Table] Construction in progress in Accounts Payable Construction in Progress Expenditures Incurred but Not yet Paid Goodwill [Line Items] Goodwill [Line Items] Stock-based plans Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Tax Attributes of Items in Other Comprehensive Income: Other Comprehensive Income (Loss), Tax [Abstract] Multiemployer health and welfare plan contributions Multiemployer Plan, Employer Contribution, Cost Unionized Employees Concentration Risk Unionized Employees Concentration Risk [Member] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic (in dollars per share) Net income per common share - basic (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Dressings and sauces [Member] Dressings And Sauces [Member] Dressings And Sauces [Member] Award Date [Axis] Award Date [Axis] Total deferred tax assets, gross Deferred Tax Assets, Gross Summary Of Financial Information Attributable To Reportable Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Deferred income taxes and other changes Deferred income taxes and other noncash changes The component of income tax expense for the period representing the net change in the entity's deferred tax assets and liabilities pertaining to continuing operations and other noncash expense and income items. Total current provision Current Income Tax Expense (Benefit) Weighted Average Exercise Price, Exercised (in dollars per share) Share Based Compensation Arrangements By Share Based Payment Award Stock Settled Stock Appreciation Rights Exercises In Period Weighted Average Exercise Price Weighted average price at which rights holders acquired shares when converting their stock-settled stock appreciation rights to shares. 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Performance Shares, Activity [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Current portion of long-term debt Current portion of long-term debt Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Name Measure Name Shelf-stable dressings, sauces and croutons [Member] Shelf-Stable Dressings, Sauces And Croutons [Member] Shelf-Stable Dressings, Sauces And Croutons [Member] Current operating lease liabilities in Accrued Liabilities Operating leases Operating Lease, 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Growth Company Entity Emerging Growth Company 2029 Long-Term Debt, Maturity, Year Three 2027 Finance Lease, Liability, to be Paid, Year One Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Supplemental noncash information on operating lease liabilities arising from obtaining right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Weighted-average remaining term of finance leases Finance Lease, Weighted Average Remaining Lease Term Finance lease cost: Lease, Cost [Abstract] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Less: unamortized debt issuance costs Debt Issuance Costs, Net Document Financial Statement Error Correction Flag Document Financial Statement Error Correction [Flag] State and local income taxes, net of federal effect Effective Income Tax Rate Reconciliation, State 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Workforce Subject to Collective Bargaining Arrangements [Member] Workforce Subject to Collective-Bargaining Arrangements [Member] PEO PEO [Member] Net windfall tax benefits - stock-based compensation Effective Income Tax Rate Reconciliation, Deduction, Other, Percent Defined Benefit Pension and Postretirement Benefit Plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] Disaggregation Of Foodservice Net Sales By Type Of Customer Disaggregation of Revenue [Table Text Block] Deferred tax liabilities, Intangible assets Deferred Tax Liabilities, Intangible Assets Retail & Foodservice [Member] Retail And Foodservice Combined [Member] Retail And Foodservice Combined [Member] Workers compensation Workers' Compensation Liability, Noncurrent Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Changes in valuation allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Deferred tax liabilities, Property, plant and equipment Deferred Tax Liabilities, Property, Plant and Equipment Estimated Annual Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Volatility factor of the expected market price of our common stock Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Retained Earnings [Member] Retained Earnings [Member] Weighted Average Exercise Price, Exercisable and vested at end of year (in dollars per share) Exercisable, Weighted Average Exercise Price (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Stock Settled Stock Appreciation Rights Exercisable Weighted Average Exercise Price The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of stock-settled stock appreciation rights outstanding and currently exercisable under the stock plan. 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This excludes land held for sale. Carrying amount as of the balance sheet date of long-lived, depreciable assets that include building structures held for productive use including any addition, improvement, or renovation to the structure, such as interior masonry, interior flooring, electrical, and plumbing. 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Equity Components [Axis] Equity Components [Axis] Amortization of prior service credit, tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax Grant date fair value Stock Issued During Period, Value, Restricted Stock Award, Gross Auditor Name Auditor Name Director Restricted Stock Awards [Member] Nonparticipating Restricted Stock [Member] Director Restricted Stock [Member] Director Restricted Stock Member Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Concentration Risk [Table] Concentration Risk [Table] Weighted Average Remaining Contractual Life in Years, Exercisable and vested at end of year Share Based Compensation Arrangement By Share Based Payment Award Stock Settled Stock Appreciation Rights Exercisable Weighted Average Remaining Contractual Term 1 Weighted average remaining contractual term for vested portions of stock-settled stock appreciation rights outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Number of Reportable Segments Number of Reportable Segments Inventories Business Combination, Recognized Asset Acquired, Inventory, Current Weighted Average Exercise Price, Forfeited (in dollars per share) Share Based Compensation Arrangements By Share Based Payment Award Stock Settled Stock Appreciation Rights Forfeitures In Period Weighted Average Exercise Price Weighted average price at which grantees could have acquired the underlying shares with respect to stock-settled stock appreciation rights that were terminated. 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Amortization expense Amortization of Intangible Assets Leases Lessee, Leases [Policy Text Block] Selling, General and Administrative Expenses Selling, General and Administrative Expense Grant date fair value Stock Issued During Period, Value, Performance Units, Gross Aggregate value of stock related to performance units issued during the period. lanc_AuditInformationAbstract [Abstract] Audit Information [Abstract] Audit Information [Abstract] Foodservice [Member] Foodservice [Member] Foodservice [Member] Depreciation and amortization Depreciation and Amortization Depreciation, Depletion and Amortization Other noncurrent assets Other Assets, Noncurrent Royalties Accrued Royalties, Current Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key Pension Settlement Charge Settlement charge Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement PEO Name PEO Name Line of credit facility, expiration date Line of Credit Facility, Expiration Date Schedule Of Contractual Maturities Of Long-Term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Schedule Of Construction In Progress In Accounts Payable Schedule Of Construction In Progress In Accounts Payable [Table Text Block] Tabular disclosure of construction in progress included in accounts payable at period end. Weighted Average Exercise Price, Vested and expected to vest at end of year (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Stock Settled Stock Appreciation Rights Vested And Expected To Vest Outstanding Weighted Average Exercise Price As of the balance sheet date, the weighted-average exercise price for outstanding stock-settled stock appreciation rights that are fully vested or expected to vest. Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Total finance lease cost Finance Lease Expense Total expense for finance leases. 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[Member] Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent Weighted Average Exercise Price, Granted (in dollars per share) Share Based Compensation Arrangements By Share Based Payment Award Stock Settled Stock Appreciation Rights Grants In Period Weighted Average Exercise Price Weighted average price at which grantees can acquire the shares reserved for issuance on stock-settled stock appreciation rights awarded. Inventories: Inventory, Net [Abstract] Interest paid Interest Paid, Including Capitalized Interest, Operating and Investing Activities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Deferred tax assets, Employee medical and other benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits Minimum interest coverage ratio Minimum Interest Coverage Ratio Minimum interest coverage ratio under unsecured revolving credit facility. Schedule Of Multiemployer Plans Multiemployer Plan [Table Text Block] Weighted-average remaining term of operating leases Operating Lease, Weighted Average Remaining Lease Term 2030 Long-Term Debt, Maturity, Year Four Goodwill And Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Use Of Estimates Use of Estimates, Policy [Policy Text Block] Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Entity Public Float Entity Public Float 2015 Plan [Member] Two Thousand And Fifteen Plan [Member] Two Thousand And Fifteen Plan [Member] Construction in progress Construction in Progress, Gross Rollforward Of Goodwill Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Restructuring and impairment charges Restructuring Costs and Asset Impairment Charges Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Number of Rights Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Branded and other [Member] Branded And Other [Member] Branded And Other [Member] Capitalized Software Costs - Net Capitalized Computer Software, Net 2031 Finance Lease, Liability, to be Paid, Year Five Line of credit facility, maximum borrowing capacity on obtaining consent of the issuing bank Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Distribution Accrued Distribution Costs Carrying value as of the balance sheet date of obligations incurred through that date and payable for various costs associated with shipping products to the customer. These accruals are based on historical information as may be modified by estimates of actual costs incurred. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and equivalents Cash and Cash Equivalent Number of Units, Vested Number of Shares, Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Finance Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]