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Segment Information (Sales By Product Category) (Details) (USD $)	3 Months Ended								12 Months Ended
	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Segment Reporting Information By Segment [Line Items]
Net sales	$ 964,838,000us-gaap_SalesRevenueGoodsNet	$ 978,262,000us-gaap_SalesRevenueGoodsNet	$ 947,761,000us-gaap_SalesRevenueGoodsNet	$ 945,125,000us-gaap_SalesRevenueGoodsNet	$ 948,854,000us-gaap_SalesRevenueGoodsNet	$ 934,015,000us-gaap_SalesRevenueGoodsNet	$ 920,694,000us-gaap_SalesRevenueGoodsNet	$ 934,977,000us-gaap_SalesRevenueGoodsNet	$ 3,835,985,953us-gaap_SalesRevenueGoodsNet	$ 3,738,540,461us-gaap_SalesRevenueGoodsNet	$ 3,718,314,651us-gaap_SalesRevenueGoodsNet
Grocery [Member]
Segment Reporting Information By Segment [Line Items]
Net sales									1,397,870,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GroceryMember	1,424,869,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GroceryMember	1,447,520,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GroceryMember
Non-Foods [Member]
Segment Reporting Information By Segment [Line Items]
Net sales									729,934,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_NonFoodsMember	707,294,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_NonFoodsMember	709,959,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_NonFoodsMember
Perishables [Member]
Segment Reporting Information By Segment [Line Items]
Net sales									937,402,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_PerishablesMember	898,956,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_PerishablesMember	866,252,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_PerishablesMember
Gasoline [Member]
Segment Reporting Information By Segment [Line Items]
Net sales									618,147,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GasolineMember	568,701,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GasolineMember	553,779,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GasolineMember
Grocery Sales [Member]
Segment Reporting Information By Segment [Line Items]
Net sales									$ 3,683,353,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GrocerySalesMember	$ 3,599,820,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GrocerySalesMember	$ 3,577,510,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GrocerySalesMember

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and 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(a))

-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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