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Share-Based Payments - Summary of Stock Warrant Activity (Detail) | 6 Months Ended
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Jul. 17, 2021 shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock warrant, outstanding and nonvested | 4,349,817
Vested | 217,492
Stock warrant, outstanding and nonvested | 4,132,325

X
- Definition Class of warrants or rights number of securities vested. + References No definition available. + Details
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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
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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