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Share-Based Payments - Summary of Stock Warrant Activity (Detail) - shares	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Share-Based Payment Arrangement [Abstract]
Stock warrant, outstanding and nonvested	3,914,833	4,349,817	0
Granted			5,437,272
Vested	(434,984)	(434,984)	(1,087,455)
Stock warrant, outstanding and nonvested	3,479,849	3,914,833	4,349,817

X

- Definition

Class of warrants or right number of securities granted.

+ References

No definition available.

+ Details

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

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

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