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Concentration of Credit Risk - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 03, 2015
Concentration Of Credit Risk [Line Items]
Outstanding lease obligations	$ 0.5sptn_OperatingLeaseObligationsGuaranteed
Present value of potential obligation with respect to sub-lease	16.2sptn_PresentValueOfMaximumPotentialSubleaseObligation
Assigned sublease obligation	5.5sptn_AssignedSubleaseObligation
Bank debt guaranteed obligation	2.0us-gaap_GuaranteeObligationsCurrentCarryingValue
Payments required under guarantee	0sptn_PaymentsRequiredUnderGuarantee
Loss incurred under guarantee	0sptn_LossIncurredUnderGuarantee
Debt
Concentration Of Credit Risk [Line Items]
Maximum undiscounted payments, default of guarantees	2.0sptn_MaximumUndiscountedPaymentsDefaultOfGuarantees / us-gaap_DerivativeByNatureAxis = us-gaap_DebtMember
Lease Agreements [Member]
Concentration Of Credit Risk [Line Items]
Maximum undiscounted payments, default of guarantees	$ 0.5sptn_MaximumUndiscountedPaymentsDefaultOfGuarantees / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember
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

- 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

Maximum undiscounted payments default of guarantees.

+ References

No definition available.

+ Details

Name:	sptn_MaximumUndiscountedPaymentsDefaultOfGuarantees
Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Operating lease obligations guaranteed.

+ References

No definition available.

+ Details

Name:	sptn_OperatingLeaseObligationsGuaranteed
Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

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_DerivativeByNatureAxis=us-gaap_DebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LeaseAgreementsMember
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:

X

- Details

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