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Line of Business (Details Textual) (Domestic [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 29, 2012 | Sep. 24, 2011 | Sep. 25, 2010
Shopping center rentals [Member] |  |  |
Lines of Business (Textual) [Abstract] |  |  |
Revenue from shopping center rentals, net of shopping center expense | $ 6.9 | $ 7.2 | $ 7.4
Fluid dairy [Member] |  |  |
Lines of Business (Textual) [Abstract] |  |  |
Fluid dairy segment | $ 58.5 | $ 59.6 | $ 55.7

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- Details
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Namespace Prefix: | imkta_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Shopping center expense. + References No definition available. + Details
Name: | imkta_ShoppingCenterExpense
Namespace Prefix: | imkta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of revenue from transactions with other operating segments of the same entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration