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Reporting Segment Information - Summary of Sales by Type of Similar Products and Services (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
Revenue from External Customer [Line Items]
Consolidated 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
Percentage Consolidated Net Sale								100.00%sptn_PercentageConsolidatedNetSale		100.00%sptn_PercentageConsolidatedNetSale	100.00%sptn_PercentageConsolidatedNetSale
Fuel [Member]
Revenue from External Customer [Line Items]
Consolidated net sales								145,631us-gaap_SalesRevenueNet / us-gaap_EnergyAxis = us-gaap_FuelMember		178,111us-gaap_SalesRevenueNet / us-gaap_EnergyAxis = us-gaap_FuelMember	179,012us-gaap_SalesRevenueNet / us-gaap_EnergyAxis = us-gaap_FuelMember
Percentage Consolidated Net Sale								5.60%sptn_PercentageConsolidatedNetSale / us-gaap_EnergyAxis = us-gaap_FuelMember		2.20%sptn_PercentageConsolidatedNetSale / us-gaap_EnergyAxis = us-gaap_FuelMember	6.90%sptn_PercentageConsolidatedNetSale / us-gaap_EnergyAxis = us-gaap_FuelMember
Non Perishables
Revenue from External Customer [Line Items]
Consolidated net sales								1,393,157us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = sptn_NonPerishablesMember		4,998,895us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = sptn_NonPerishablesMember	1,289,461us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = sptn_NonPerishablesMember
Percentage Consolidated Net Sale								53.60%sptn_PercentageConsolidatedNetSale / us-gaap_ProductOrServiceAxis = sptn_NonPerishablesMember		63.10%sptn_PercentageConsolidatedNetSale / us-gaap_ProductOrServiceAxis = sptn_NonPerishablesMember	49.40%sptn_PercentageConsolidatedNetSale / us-gaap_ProductOrServiceAxis = sptn_NonPerishablesMember
Perishables
Revenue from External Customer [Line Items]
Consolidated net sales								894,783us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = sptn_PerishablesMember		2,449,562us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = sptn_PerishablesMember	930,659us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = sptn_PerishablesMember
Percentage Consolidated Net Sale								34.50%sptn_PercentageConsolidatedNetSale / us-gaap_ProductOrServiceAxis = sptn_PerishablesMember		31.00%sptn_PercentageConsolidatedNetSale / us-gaap_ProductOrServiceAxis = sptn_PerishablesMember	35.70%sptn_PercentageConsolidatedNetSale / us-gaap_ProductOrServiceAxis = sptn_PerishablesMember
Pharmacy [Member]
Revenue from External Customer [Line Items]
Consolidated net sales								$ 163,659us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = sptn_PharmacyMember		$ 289,494us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = sptn_PharmacyMember	$ 209,028us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = sptn_PharmacyMember
Percentage Consolidated Net Sale								6.30%sptn_PercentageConsolidatedNetSale / us-gaap_ProductOrServiceAxis = sptn_PharmacyMember		3.70%sptn_PercentageConsolidatedNetSale / us-gaap_ProductOrServiceAxis = sptn_PharmacyMember	8.00%sptn_PercentageConsolidatedNetSale / us-gaap_ProductOrServiceAxis = sptn_PharmacyMember

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- Definition

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+ References

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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