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Revenue - Additional Information (Detail) | 12 Months Ended
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Jan. 02, 2021 USD ($)
Disaggregation Of Revenue [Line Items] |
Revenue recognition performance obligation | $ 0
Revenue, remaining performance obligation, optional exemption, performance obligation | true
Revenue recognition payment terms | 30 days
Contract assets | $ 0
Recognized bad debt expense | 700,000
Present value of potential obligation for sub-lease | 6,500,000
Assigned sublease obligation | $ 11,700,000
Maximum [Member] |
Disaggregation Of Revenue [Line Items] |
Revenue recognition contract terms | 1 year
Loan repayable period | 10 years
Minimum [Member] |
Disaggregation Of Revenue [Line Items] |
Loan repayable period | 5 years

X
- Definition Assigned sublease obligation. + References No definition available. + Details
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Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Loan repayable period. + References No definition available. + Details
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Namespace Prefix: | sptn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Present value of maximum potential sublease obligation. + References No definition available. + Details
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Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Provision for recovery of doubtful accounts. + 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 Revenue recognition contract terms. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Revenue recognition payment terms. + References No definition available. + Details
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Namespace Prefix: | sptn_
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Balance Type: | na
Period Type: | duration

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- Definition Revenue recognition performance obligation. + References No definition available. + Details
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Namespace Prefix: | sptn_
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Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Indicates (true false) whether optional exemption was applied not to disclose amount of transaction price allocated to and explanation of expected timing of revenue recognition for remaining performance obligation, when contract has expected duration of one year or less or right to consideration corresponds directly to performance completed. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 + Details
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- Details
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Period Type: |

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- Details
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Period Type: |