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Segment Information (Sales By Product Category) (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Segment Reporting Information By Segment [Line Items]
Net sales	$ 915,334,689us-gaap_SalesRevenueGoodsNet	$ 947,760,587us-gaap_SalesRevenueGoodsNet	$ 1,879,831,524us-gaap_SalesRevenueGoodsNet	$ 1,892,885,457us-gaap_SalesRevenueGoodsNet
Grocery [Member]
Segment Reporting Information By Segment [Line Items]
Net sales	348,269us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GroceryMember	355,658us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GroceryMember	706,585,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GroceryMember	714,557,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GroceryMember
Non-Foods [Member]
Segment Reporting Information By Segment [Line Items]
Net sales	185,428us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_NonFoodsMember	176,580us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_NonFoodsMember	375,576,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_NonFoodsMember	358,454,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_NonFoodsMember
Perishables [Member]
Segment Reporting Information By Segment [Line Items]
Net sales	241,002us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_PerishablesMember	230,450us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_PerishablesMember	480,613,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_PerishablesMember	457,052,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_PerishablesMember
Gasoline [Member]
Segment Reporting Information By Segment [Line Items]
Net sales	105,139us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GasolineMember	145,760us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GasolineMember	243,066,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GasolineMember	288,471,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GasolineMember
Grocery Sales [Member]
Segment Reporting Information By Segment [Line Items]
Net sales	$ 879,838us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GrocerySalesMember	$ 908,448us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GrocerySalesMember	$ 1,805,840,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GrocerySalesMember	$ 1,818,534,000us-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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