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Reporting Segment Information - Schedule of Segment Reporting Information, by Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended					4 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Jan. 03, 2015	Oct. 04, 2014	Jul. 12, 2014	Sep. 14, 2013	Jun. 22, 2013	Apr. 19, 2014	Dec. 28, 2013	Dec. 28, 2013	Jan. 05, 2013	Jan. 03, 2015	Mar. 30, 2013
Segment Reporting Information [Line Items]
Net sales	$ 1,962,589us-gaap_SalesRevenueNet	$ 1,809,571us-gaap_SalesRevenueNet	$ 1,810,175us-gaap_SalesRevenueNet	$ 649,471us-gaap_SalesRevenueNet	$ 612,405us-gaap_SalesRevenueNet	$ 2,333,727us-gaap_SalesRevenueNet	$ 1,335,354us-gaap_SalesRevenueNet	$ 2,597,230us-gaap_SalesRevenueNet	$ 2,015,351us-gaap_SalesRevenueNet	$ 7,916,062us-gaap_SalesRevenueNet	$ 2,608,160us-gaap_SalesRevenueNet
Merger transaction and integration expenses	4,547us-gaap_BusinessCombinationIntegrationRelatedCosts	1,379us-gaap_BusinessCombinationIntegrationRelatedCosts	2,581us-gaap_BusinessCombinationIntegrationRelatedCosts	3,638us-gaap_BusinessCombinationIntegrationRelatedCosts	1,836us-gaap_BusinessCombinationIntegrationRelatedCosts	4,168us-gaap_BusinessCombinationIntegrationRelatedCosts	15,519us-gaap_BusinessCombinationIntegrationRelatedCosts	20,993us-gaap_BusinessCombinationIntegrationRelatedCosts		12,675us-gaap_BusinessCombinationIntegrationRelatedCosts
Depreciation and amortization								37,082us-gaap_DepreciationAndAmortization		86,994us-gaap_DepreciationAndAmortization	39,081us-gaap_DepreciationAndAmortization
Operating earnings								16,793us-gaap_OperatingIncomeLoss	42,208us-gaap_OperatingIncomeLoss	114,846us-gaap_OperatingIncomeLoss	60,968us-gaap_OperatingIncomeLoss
Capital expenditures								37,200us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	33,932us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	90,012us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	42,012us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total Assets	1,932,282us-gaap_Assets						1,983,651us-gaap_Assets	1,983,651us-gaap_Assets		1,932,282us-gaap_Assets	789,667us-gaap_Assets
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total Assets	4,742us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember						4,767us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	4,767us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember		4,742us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	5,501us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales								2,597,230us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember		7,916,062us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	2,608,160us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales								(533,470)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember		(1,005,844)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember	(634,525)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Military [Member]
Segment Reporting Information [Line Items]
Merger transaction and integration expenses										27us-gaap_BusinessCombinationIntegrationRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Depreciation and amortization								1,412us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember		11,350us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Operating earnings								1,901us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember		21,721us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Capital expenditures								2,246us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember		15,088us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Total Assets	435,647us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember						451,518us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember	451,518us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember		435,647us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Military [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales								248,643us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember		2,275,512us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_MilitaryMember
Food Distribution [Member]
Segment Reporting Information [Line Items]
Merger transaction and integration expenses								20,993us-gaap_BusinessCombinationIntegrationRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember		12,644us-gaap_BusinessCombinationIntegrationRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Depreciation and amortization								7,706us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember		29,816us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	6,346us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Operating earnings								(1,328)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember		54,802us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	23,920us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Capital expenditures								13,867us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember		31,953us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	8,797us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Total Assets	763,914us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember						805,468us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	805,468us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember		763,914us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	254,326us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Food Distribution [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales								1,095,759us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember		3,356,331us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	1,120,650us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Food Distribution [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales								(533,470)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember		(1,005,844)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember	(634,525)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = sptn_DistributionMember
Retail [Member]
Segment Reporting Information [Line Items]
Merger transaction and integration expenses										4us-gaap_BusinessCombinationIntegrationRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Depreciation and amortization								27,964us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember		45,828us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember	32,735us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Operating earnings								16,220us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember		38,323us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember	37,048us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Capital expenditures								21,087us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember		42,971us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember	33,215us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Total Assets	727,979us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember						721,898us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember	721,898us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember		727,979us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember	529,840us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember
Retail [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales								$ 1,252,828us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember		$ 2,284,219us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember	$ 1,487,510us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = sptn_RetailMember

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- Definition

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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