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Concentration of Credit Risk - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) Retailer
Concentration Of Credit Risk [Line Items] |
Number of independent retailer for unearned advanced amount | Retailer | 1
Percent of unearned advanced amount to total assets | 2.00%
Present value of potential obligation for sub-lease | $ 11.3
Assigned sublease obligation | 15.6
Bank debt guaranteed | 1.7
Payments required under guarantee | 0.0
Loss incurred under guarantee | $ 0.0
Minimum [Member] |
Concentration Of Credit Risk [Line Items] |
Loan repayable period | 5 years
Maximum [Member] |
Concentration Of Credit Risk [Line Items] |
Loan repayable period | 7 years

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

X
- Definition Concentration of credit risk. + References No definition available. + Details
Name: | sptn_ConcentrationOfCreditRiskLineItems
Namespace Prefix: | sptn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Loss incurred under guarantee. + References No definition available. + Details
Name: | sptn_LossIncurredUnderGuarantee
Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of independent retailer unearned advanced amount. + References No definition available. + Details
Name: | sptn_NumberOfIndependentRetailerUnearnedAdvancedAmount
Namespace Prefix: | sptn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payments required under guarantee. + References No definition available. + Details
Name: | sptn_PaymentsRequiredUnderGuarantee
Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percent of unearned advanced amount to net assets. + References No definition available. + Details
Name: | sptn_PercentOfUnearnedAdvancedAmountToNetAssets
Namespace Prefix: | sptn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |