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Segment Information (Sales By Product Category) (Details) (USD $)	3 Months Ended
	Dec. 27, 2014	Dec. 28, 2013
Segment Reporting Information By Segment [Line Items]
Net sales	$ 964,496,835us-gaap_SalesRevenueGoodsNet	$ 945,124,870us-gaap_SalesRevenueGoodsNet
Grocery [Member]
Segment Reporting Information By Segment [Line Items]
Net sales	358,317,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GroceryMember	358,899,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GroceryMember
Non-Foods [Member]
Segment Reporting Information By Segment [Line Items]
Net sales	190,147,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_NonFoodsMember	181,874,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_NonFoodsMember
Perishables [Member]
Segment Reporting Information By Segment [Line Items]
Net sales	239,610,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_PerishablesMember	226,602,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_PerishablesMember
Gasoline [Member]
Segment Reporting Information By Segment [Line Items]
Net sales	137,928,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GasolineMember	142,712,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GasolineMember
Grocery Sales [Member]
Segment Reporting Information By Segment [Line Items]
Net sales	$ 926,002,000us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = imkta_GrocerySalesMember	$ 910,087,000us-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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