Commitments and Contingencies - Additional Information (Detail)	Jul. 09, 2021
Commitments And Contingencies Disclosure [Abstract]
Multiemployer plan number of years relief from risk of insolvency	30 years

Multiemployer plan number of years relief from risk of insolvency.

No definition available.

Name:	sptn_MultiemployerPlanNumberOfYearsReliefFromRiskOfInsolvency
Namespace Prefix:	sptn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration