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Summary of Significant Accounting Policies and Basis of Presentation - Summary of Changes in SpartanNash's Self-Insurance Liability (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Payables And Accruals [Abstract] |  |  |
Balance at beginning of year | $ 16,780 | $ 14,291 | $ 15,155
Expenses | 62,999 | 69,253 | 49,532
Acquisitions |  | 1,894 |
Claim payments, net of employee contributions | (63,042) | (68,658) | (50,396)
Balance at end of year | $ 16,737 | $ 16,780 | $ 14,291

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- Definition Addition to insurance liability related to expense incurred. + 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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- Definition Deduction in insurance liability related to claim payments. + References No definition available. + Details
Name: | sptn_DeductionInInsuranceLiabilityRelatedToClaimPayments
Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Insurance liability related to acquisitions. + 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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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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