XML 63 R46.htm IDEA: XBRL DOCUMENT
v3.21.1

Share-Based Payments - Summary of Stock Warrant Activity (Detail) | 4 Months Ended
--- | ---
Apr. 24, 2021 shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock warrant, outstanding and nonvested | 4,349,817
Vested | 108,746
Stock warrant, outstanding and nonvested | 4,241,071

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