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Share-Based Payments - Summary of Stock Warrant Activity (Detail) - shares | 12 Months Ended
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Jan. 01, 2022 | Jan. 02, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Stock warrant, outstanding and nonvested | 4,349,817 | 0
Granted |  | 5,437,272
Vested | (434,984) | (1,087,455)
Stock warrant, outstanding and nonvested | 3,914,833 | 4,349,817

X
- Definition Class of warrants or right number of securities granted. + References No definition available. + Details
Name: | sptn_ClassOfWarrantsOrRightNumberOfSecuritiesGranted
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
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration