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v3.25.2

Stock-Based Compensation - Summary of Stock Warrant Activity (Detail) | 6 Months Ended
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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
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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
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