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Commitments and Contingencies - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Dec. 28, 2013	Jan. 03, 2015	Mar. 30, 2013
Commitments And Contingencies [Line Items]
Rents Received from Subleases	$ 2,200,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue	$ 5,000,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue	$ 1,900,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue
Percentage of Associates Represent By Union		8.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfParticipants
Maximum [Member] | Nash-Finch Company [Member]
Commitments And Contingencies [Line Items]
Legal fees and expense		$ 550,000us-gaap_LegalFees / dei_LegalEntityAxis = sptn_NashFinchCoMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

Percentage of employee participants subject to a collective bargaining arrangement to all participants in a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947

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- Definition

The amount of revenue recognized for the period under subleasing arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 55

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6584307&loc=d3e41620-112719

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