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Leases - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jan. 02, 2021 | Dec. 29, 2018
Lessee Lease Description [Line Items] |  |
Rental expense, net of sublease income, under operating leases |  | $ 58.0
Minimum [Member] |  |
Lessee Lease Description [Line Items] |  |
Leases, renewal term | 1 year |
Maximum [Member] |  |
Lessee Lease Description [Line Items] |  |
Leases, renewal term | 10 years |

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- Definition Lessee, lease renewal term. + References No definition available. + Details
Name: | sptn_LesseeLeaseRenewalTerm
Namespace Prefix: | sptn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
Name: | us-gaap_OperatingLeaseExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |