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Summary of Significant Accounting Policies and Basis of Presentation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 28, 2013	Jan. 03, 2015	Mar. 30, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Allowance for doubtful accounts	$ 2.0us-gaap_AllowanceForDoubtfulAccountsReceivable	$ 5.5us-gaap_AllowanceForDoubtfulAccountsReceivable
Bad debt expenses	1.3us-gaap_ProvisionForDoubtfulAccounts	3.0us-gaap_ProvisionForDoubtfulAccounts	0.9us-gaap_ProvisionForDoubtfulAccounts
Inventories valued on LIFO method	87.50%us-gaap_PercentageOfLIFOInventory	93.70%us-gaap_PercentageOfLIFOInventory
Under Value of carrying value of inventories than its replacement value	45.1us-gaap_InventoryValuationReserves	50.7us-gaap_InventoryValuationReserves
Effect on income due to change in LIFO valuation on liquidation	0.1us-gaap_EffectOfLIFOInventoryLiquidationOnIncome	0.8us-gaap_EffectOfLIFOInventoryLiquidationOnIncome	1.0us-gaap_EffectOfLIFOInventoryLiquidationOnIncome
Capitalized computer software	19.2us-gaap_CapitalizedComputerSoftwareGross	17.7us-gaap_CapitalizedComputerSoftwareGross
Workers' compensation liability		0.5us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent
General liability		0.5sptn_GeneralInsuranceLiability
Automobile liability		0.5sptn_AutomobileInsuranceLiability
Health care insurance liability		0.5sptn_HealthCareInsuranceLiability
Current portion of self insurance liability	13.1us-gaap_SelfInsuranceReserveCurrent	13.3us-gaap_SelfInsuranceReserveCurrent
Long term portion of self insurance liability	9.4us-gaap_SelfInsuranceReserveNoncurrent	6.1us-gaap_SelfInsuranceReserveNoncurrent
Weighted average shares not included in earnings per share calculations	334,172us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	322,914us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	369,969us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Issuance of preferred stock	10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Advertising expenses	$ 15.3us-gaap_AdvertisingExpense	$ 41.1us-gaap_AdvertisingExpense	$ 13.6us-gaap_AdvertisingExpense

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