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Restructuring, Asset Impairment and Other - Schedule of Restructuring,Asset Impairment and Other (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
Jun. 22, 2013
Apr. 19, 2014
Dec. 28, 2013
Dec. 28, 2013
Jan. 05, 2013
Jan. 03, 2015
Mar. 30, 2013
Restructuring Cost And Reserve [Line Items]                    
Asset impairment charges             $ 9,691us-gaap_AssetImpairmentCharges   $ 7,550us-gaap_AssetImpairmentCharges $ 1,682us-gaap_AssetImpairmentCharges
Gains on sales of assets related to closed sites                 (4,518)us-gaap_GainLossOnDispositionOfAssets1  
Provision for severance             1,061us-gaap_SeveranceCosts1   306us-gaap_SeveranceCosts1  
Other costs associated with distribution center and store closings                 1,504us-gaap_OtherRestructuringCosts  
Changes in estimates             (31)sptn_RestructuringReserveChangeInEstimates   781sptn_RestructuringReserveChangeInEstimates (93)sptn_RestructuringReserveChangeInEstimates
Restructuring, asset impairment and other 6,233us-gaap_RestructuringCostsAndAssetImpairmentCharges (1,272)us-gaap_RestructuringCostsAndAssetImpairmentCharges 1,078us-gaap_RestructuringCostsAndAssetImpairmentCharges 987us-gaap_RestructuringCostsAndAssetImpairmentCharges 127us-gaap_RestructuringCostsAndAssetImpairmentCharges 14,657us-gaap_RestructuringCostsAndAssetImpairmentCharges 15,644us-gaap_RestructuringCostsAndAssetImpairmentCharges 356us-gaap_RestructuringCostsAndAssetImpairmentCharges 6,166us-gaap_RestructuringCostsAndAssetImpairmentCharges 1,589us-gaap_RestructuringCostsAndAssetImpairmentCharges
Business Restructuring Reserves [Member]                    
Restructuring Cost And Reserve [Line Items]                    
Provision for leases and related ancillary costs, net of sublease income, related to store closings             $ 4,923sptn_ProvisionForLeaseAndRelatedAncillaryCosts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_BusinessRestructuringReservesMember
  $ 543sptn_ProvisionForLeaseAndRelatedAncillaryCosts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_BusinessRestructuringReservesMember