Derivatives - Schedule of gains recognized in the condensed consolidated statements of earnings for the interest rate swap, presented on a pre-tax basis (Details) - USD ($) $ in Thousands	4 Months Ended
Apr. 19, 2025	Apr. 20, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Total amounts of expense line items presented in the condensed consolidated statements of earnings in which the effects of cash flow hedges are recorded	$ 15,212	$ 13,487
Gain on cash flow hedging relationships:
Gain reclassified from comprehensive income into earnings	$ 322	$ 789

Total amounts of expense line items presented in the condensed consolidated statements of earnings in which the effects of cash flow hedges are recorded

No definition available.

Name:	sptn_TotalAmountsOfExpenseLineItemsPresentedInTheCondensedConsolidatedStatementsOfEarningsInWhichTheEffectsOfCashFlowHedgesAreRecorded
Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration