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Employee Benefit Plans (Details) (USD $)	12 Months Ended
	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

X

- 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

X

- Details

Name:	imkta_EmployeeBenefitPlansTextualAbstract
Namespace Prefix:	imkta_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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