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Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 28, 2013 | Sep. 29, 2012 | Sep. 24, 2011
Segment Reporting Information [Line Items] |  |  |
Increase in net sales from shopping center rentals |  | $ 8.9 | $ 9.1
Increase in cost of goods sold from shopping center rentals |  | 7.4 | 7.2
Fluid Dairy [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | $ 58.3 | $ 58.5 | $ 59.6

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- Definition Increase in Cost of Goods Sold from Shopping Center Rentals + References No definition available. + Details
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- Definition Increase in Net Sales from Shopping Center Rentals + References No definition available. + Details
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Namespace Prefix: | imkta_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Intercompany eliminations. + References No definition available. + Details
Name: | imkta_IntercompanyEliminations
Namespace Prefix: | imkta_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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