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v3.21.1

Share-Based Payments - Summary of Share-based Payment Expense Recognized as a Reduction of Net Sales in Condensed Consolidated Statements of Operations (Detail) $ in Thousands | 4 Months Ended
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Apr. 24, 2021 USD ($)
Employee Service Share Based Compensation Aggregate Disclosures [Abstract] |
Warrant expense | $ 645
Tax benefits | (57)
Warrant expense, net of tax | $ 588

X
- Definition Class of warrant or right expense before tax. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Class of warrant or right income tax expense (benefit). + References No definition available. + Details
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Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Class of warrant or right stock based compensation expense net of tax. + References No definition available. + Details
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Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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