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Stockholder's Equity (Details Textual) | 12 Months Ended
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Sep. 29, 2012 Directors
Maximum [Member] |
Stockholders' Equity (Textual) [Abstract] |
Number of directors set by board of directors | 11
Minimum [Member] |
Stockholders' Equity (Textual) [Abstract] |
Number of directors set by board of directors | 5
Class A Common Stock [Member] |
Stockholders' Equity (Textual) [Abstract] |
Percentage of cash dividend or liquidation payment based on Class B common stock | 110.00%
Number of votes per share held by common stock holders | 1
Percentage of directors to be elected by holders of common stock | 25.00%
Class B Common Stock [Member] |
Stockholders' Equity (Textual) [Abstract] |
Number of votes per share held by common stock holders | 10
Minimum percentage of outstanding common stock of both classes represented by common stock | 12.50%

X
- Definition Number of directors. + References No definition available. + Details
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X
- Definition Number of votes per share held by common stock holders. + References No definition available. + Details
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Namespace Prefix: | imkta_
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Balance Type: | na
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X
- Definition Percentage of cash dividend or liquidation payment on class B common stock payable to other class common stock. + References No definition available. + Details
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Namespace Prefix: | imkta_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of common stock for class B common stock. + References No definition available. + Details
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Namespace Prefix: | imkta_
Data Type: | num:percentItemType
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X
- Definition Percentage of directors to be elected by holders of common stock. + References No definition available. + Details
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Namespace Prefix: | imkta_
Data Type: | num:percentItemType
Balance Type: | na
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X
- Details
Name: | imkta_StockholdersEquityTextualAbstract
Namespace Prefix: | imkta_
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