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Employee Benefit Plans (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 28, 2013 | Sep. 29, 2012 | Sep. 24, 2011
Investment Profit Sharing Plan [Member] |  |  |
Postemployment and Postretirement Benefit Plans [Line Items] |  |  |
Operating and administrative expenses | $ 1,300,000 | $ 1,300,000 | $ 1,200,000
Nonqualified Investment Plan [Member] |  |  |
Postemployment and Postretirement Benefit Plans [Line Items] |  |  |
Operating and administrative expenses | 77,000 | 71,000 | 64,000
Cash Bonuses [Member] |  |  |
Postemployment and Postretirement Benefit Plans [Line Items] |  |  |
Operating and administrative expenses | $ 9,000,000 | $ 10,000,000 | $ 9,700,000

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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 Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration