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Merger - Summary of Results of Operations (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
Dec. 28, 2013
Business Acquisition [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  
Net earnings 11,871us-gaap_NetIncomeLoss 17,096us-gaap_NetIncomeLoss 17,319us-gaap_NetIncomeLoss 10,050us-gaap_NetIncomeLoss 4,683us-gaap_NetIncomeLoss 12,310us-gaap_NetIncomeLoss (13,992)us-gaap_NetIncomeLoss 741us-gaap_NetIncomeLoss 19,708us-gaap_NetIncomeLoss 58,596us-gaap_NetIncomeLoss 27,410us-gaap_NetIncomeLoss  
Nash-Finch Company [Member]                        
Business Acquisition [Line Items]                        
Net sales                   5,248,617us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= sptn_NashFinchCoMember		   563,185us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= sptn_NashFinchCoMember
Net earnings                   $ 24,731us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= sptn_NashFinchCoMember		   $ 769us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= sptn_NashFinchCoMember