Quarterly Financial Information (unaudited) - Schedule of Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, 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
Quarterly Financial Information Disclosure [Abstract]
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
Gross profit	282,213us-gaap_GrossProfit	261,409us-gaap_GrossProfit	265,114us-gaap_GrossProfit	136,296us-gaap_GrossProfit	125,276us-gaap_GrossProfit	347,338us-gaap_GrossProfit	225,308us-gaap_GrossProfit	486,880us-gaap_GrossProfit	412,901us-gaap_GrossProfit	1,156,074us-gaap_GrossProfit	545,544us-gaap_GrossProfit
Merger transaction and integration expenses	4,547	1,379	2,581	3,638	1,836	4,168	15,519	20,993		12,675
Restructuring and asset impairment	6,233	(1,272)	1,078		987	127	14,657	15,644	356	6,166	1,589
Debt extinguishment							5,527	5,527	2,285		5,047
Earnings (loss) from continuing operations before income taxes	15,030	28,146	27,174	15,870	7,680	20,099	(21,480)	2,070	30,255	90,449	43,267
Earnings from continuing operations	12,037	17,169	17,395	10,115	4,784	12,519	(13,670)	1,229	19,903	59,120	27,842
Discontinued operations, net of taxes	(166)	(73)	(76)	(65)	(101)	(209)	(322)	(488)	(195)	(524)	(432)
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
Earnings (loss) from continuing operations per share:
Earnings from continuing operations	$ 0.32	$ 0.46	$ 0.46	$ 0.46	$ 0.22	$ 0.33	$ (0.49)	$ 0.05	$ 0.91	$ 1.57	$ 1.28
Earnings from continuing operations	$ 0.32	$ 0.45	$ 0.46	$ 0.46	$ 0.22	$ 0.33	$ (0.49)	$ 0.05	$ 0.91	$ 1.57	$ 1.27
Net earnings (loss) per share:
Basic	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ (0.50)us-gaap_EarningsPerShareBasic	$ 0.03us-gaap_EarningsPerShareBasic	$ 0.90us-gaap_EarningsPerShareBasic	$ 1.56us-gaap_EarningsPerShareBasic	$ 1.26us-gaap_EarningsPerShareBasic
Diluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ (0.50)us-gaap_EarningsPerShareDiluted	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.90us-gaap_EarningsPerShareDiluted	$ 1.55us-gaap_EarningsPerShareDiluted	$ 1.25us-gaap_EarningsPerShareDiluted
Dividends	$ 4,502us-gaap_Dividends	$ 4,529us-gaap_Dividends	$ 4,526us-gaap_Dividends	$ 1,969us-gaap_Dividends	$ 1,970us-gaap_Dividends	$ 4,533us-gaap_Dividends	$ 1,969us-gaap_Dividends	$ 5,908us-gaap_Dividends		$ 18,090us-gaap_Dividends	$ 6,899us-gaap_Dividends
Common stock price – High	$ 26.89sptn_CommonStockPricePerShareHigh	$ 22.50sptn_CommonStockPricePerShareHigh	$ 24.68sptn_CommonStockPricePerShareHigh	$ 24.40sptn_CommonStockPricePerShareHigh	$ 19.73sptn_CommonStockPricePerShareHigh	$ 25.74sptn_CommonStockPricePerShareHigh	$ 24.78sptn_CommonStockPricePerShareHigh	$ 24.78sptn_CommonStockPricePerShareHigh		$ 26.89sptn_CommonStockPricePerShareHigh
Common stock price – Low	$ 19.88sptn_CommonStockPricePerShareLow	$ 19.16sptn_CommonStockPricePerShareLow	$ 19.44sptn_CommonStockPricePerShareLow	$ 17.90sptn_CommonStockPricePerShareLow	$ 16.10sptn_CommonStockPricePerShareLow	$ 21.00sptn_CommonStockPricePerShareLow	$ 21.02sptn_CommonStockPricePerShareLow	$ 16.10sptn_CommonStockPricePerShareLow		$ 19.16sptn_CommonStockPricePerShareLow

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