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Concentration of Credit Risk - Additional Information (Detail) $ in Millions	12 Months Ended
	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: