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Operating Segment Information - Schedule of Segment Reporting Information, by Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified	4 Months Ended
	Apr. 25, 2015	Apr. 19, 2014	Jan. 03, 2015
Segment Reporting Information [Line Items]
Net sales	$ 2,312,683us-gaap_SalesRevenueNet	$ 2,333,727us-gaap_SalesRevenueNet
Merger integration and acquisition expenses	2,684us-gaap_BusinessCombinationIntegrationRelatedCosts	4,168us-gaap_BusinessCombinationIntegrationRelatedCosts
Depreciation and amortization	25,785us-gaap_DepreciationAndAmortization	27,553us-gaap_DepreciationAndAmortization
Operating earnings	23,853us-gaap_OperatingIncomeLoss	27,578us-gaap_OperatingIncomeLoss
Capital expenditures	12,724us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	22,839us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total Assets	1,915,795us-gaap_Assets		1,932,282us-gaap_Assets
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total Assets	4,742us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember		4,742us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Military [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	3,733us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember	4,277us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Operating earnings	6,158us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember	4,421us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Capital expenditures	584us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember	10,195us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Total Assets	462,978us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember		435,647us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Food Distribution [Member]
Segment Reporting Information [Line Items]
Merger integration and acquisition expenses	2,187us-gaap_BusinessCombinationIntegrationRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	4,168us-gaap_BusinessCombinationIntegrationRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Depreciation and amortization	8,536us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	9,019us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Operating earnings	20,249us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	14,209us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Capital expenditures	3,553us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	6,567us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Total Assets	742,732us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember		763,914us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Retail [Member]
Segment Reporting Information [Line Items]
Merger integration and acquisition expenses	497us-gaap_BusinessCombinationIntegrationRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Depreciation and amortization	13,516us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember	14,257us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Operating earnings	(2,554)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember	8,948us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Capital expenditures	8,587us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember	6,077us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Total Assets	705,343us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember		727,979us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	2,312,683us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	2,333,727us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Military [Member]
Segment Reporting Information [Line Items]
Net sales	699,394us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember	684,167us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Operating Segments [Member] | Food Distribution [Member]
Segment Reporting Information [Line Items]
Net sales	986,435us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	971,002us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Operating Segments [Member] | Retail [Member]
Segment Reporting Information [Line Items]
Net sales	626,854us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember	678,558us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(281,275)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember	(296,346)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Intersegment Eliminations [Member] | Food Distribution [Member]
Segment Reporting Information [Line Items]
Net sales	$ (281,275)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	$ (296,346)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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