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Employee Benefit Plans (Details) (USD $) | 12 Months Ended
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Sep. 29, 2012 | Sep. 24, 2011 | Sep. 25, 2010
Employee Benefit Plans (Textual) [Abstract] |  |  |
Discretionary bonus expense to managerial personnel | $ 10,000,000 | $ 9,700,000 | $ 9,600,000
Investment/Profit Sharing Plan [Member] |  |  |
Employee Benefit Plans (Textual) [Abstract] |  |  |
Operating and administrative expenses | 1,331,000 | 1,198,000 | 1,093,000
Nonqualified Investment Plan [Member] |  |  |
Employee Benefit Plans (Textual) [Abstract] |  |  |
Operating and administrative expenses | $ 71,000 | $ 64,000 | $ 59,000

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- Definition Discretionary bonus expense to managerial personnel. + References No definition available. + Details
Name: | imkta_DiscretionaryBonusExpenseToManagerialPersonnel
Namespace Prefix: | imkta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | imkta_EmployeeBenefitPlansTextualAbstract
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
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration