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Stock-Based Compensation - Summary of Stock Warrant Activity (Detail)	6 Months Ended
	Jul. 12, 2025 shares
Share-Based Payment Arrangement [Abstract]
Stock warrant, outstanding and nonvested	3,044,865
Vested	(108,746)
Stock warrant, outstanding and nonvested	2,936,119

X

- Definition

Class of warrants or rights number of securities vested.

+ References

No definition available.

+ Details

Name:	sptn_ClassOfWarrantsOrRightsNumberOfSecuritiesVested
Namespace Prefix:	sptn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration