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Summary of Significant Accounting Policies and Basis of Presentation - Summary of Changes in SpartanNash's Self-Insurance Liability (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 28, 2013	Jan. 03, 2015	Mar. 30, 2013
Payables And Accruals [Abstract]
Beginning balance	$ 7,167us-gaap_AccruedInsuranceCurrentAndNoncurrent	$ 22,454us-gaap_AccruedInsuranceCurrentAndNoncurrent	$ 5,714us-gaap_AccruedInsuranceCurrentAndNoncurrent
Balance assumed in merger	13,248sptn_AdditionToInsuranceLiabilityRelatedToMerger
Expense	25,291sptn_DeductionInInsuranceLiabilityRelatedToClaimPayments	53,297sptn_DeductionInInsuranceLiabilityRelatedToClaimPayments	27,955sptn_DeductionInInsuranceLiabilityRelatedToClaimPayments
Claim payments, net of employee contributions	(23,252)sptn_AdditionToInsuranceLiabilityRelatedToExpenseIncurred	(56,338)sptn_AdditionToInsuranceLiabilityRelatedToExpenseIncurred	(26,502)sptn_AdditionToInsuranceLiabilityRelatedToExpenseIncurred
Ending balance	$ 22,454us-gaap_AccruedInsuranceCurrentAndNoncurrent	$ 19,413us-gaap_AccruedInsuranceCurrentAndNoncurrent	$ 7,167us-gaap_AccruedInsuranceCurrentAndNoncurrent

X

- Definition

Addition to insurance liability related to expense incurred.

+ References

No definition available.

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- Definition

Addition to insurance liability related to merger.

+ References

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- Definition

Deduction in insurance liability related to claim payments.

+ References

No definition available.

+ Details

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X

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

-Article 7



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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