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Merger - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 12, 2014	Dec. 28, 2013	Jan. 03, 2015	Mar. 30, 2013	Nov. 19, 2013
Business Acquisition [Line Items]
Common stock exchange ratio per share			1.20sptn_CommonStockExchangeRatioPerShareOrUnit
Intangible assets adjustments	$ 19,300,000us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments
Property and equipment adjustments	(23,000,000)sptn_BusinessAcquisitionPurchasePriceAdjustmentIncreaseDecreaseInPropertyPlantAndEquipment
Goodwill adjustments	3,700,000us-gaap_GoodwillPurchaseAccountingAdjustments
Goodwill		299,186,000us-gaap_Goodwill	297,280,000us-gaap_Goodwill	246,840,000us-gaap_Goodwill
Merger related expense		2,000,000sptn_MergerRelatedExpensesAfterTax	2,600,000sptn_MergerRelatedExpensesAfterTax
Restructuring charges		400,000us-gaap_RestructuringCharges	2,900,000us-gaap_RestructuringCharges
Extinguishment of debt		2,600,000us-gaap_ExtinguishmentOfDebtGainLossNetOfTax
Non-recurring transaction and integration cost		26,500,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Debt extinguishment charges [Member]
Business Acquisition [Line Items]
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Revolving credit agreement [Member]
Business Acquisition [Line Items]
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Selling, general and administrative expenses [Member]
Business Acquisition [Line Items]
Non-recurring transaction and integration cost		21,000,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Food Distribution Segment [Member]
Business Acquisition [Line Items]
Goodwill			36,600,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sptn_FoodDistributionSegmentMember
Business Acquisition, Goodwill, Expected Tax Deductible Amount			0us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_StatementBusinessSegmentsAxis = sptn_FoodDistributionSegmentMember
Fair Value Adjustments [Member]
Business Acquisition [Line Items]
Intangible assets adjustments			7,000,000us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments / us-gaap_StatementScenarioAxis = sptn_FairValueAdjustmentsMember
Goodwill					$ (6,962,000)us-gaap_Goodwill / us-gaap_StatementScenarioAxis = sptn_FairValueAdjustmentsMember

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