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Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Investment Profit Sharing Plan [Member]
Postemployment and Postretirement Benefit Plans [Line Items]
Operating and administrative expenses	$ 1,400us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = imkta_InvestmentProfitSharingPlanMember	$ 1,300us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = imkta_InvestmentProfitSharingPlanMember	$ 1,300us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = imkta_InvestmentProfitSharingPlanMember
Nonqualified Investment Plan [Member]
Postemployment and Postretirement Benefit Plans [Line Items]
Operating and administrative expenses	84us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = imkta_NonqualifiedInvestmentPlanMember	77us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = imkta_NonqualifiedInvestmentPlanMember	71us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = imkta_NonqualifiedInvestmentPlanMember
Cash Bonuses [Member]
Postemployment and Postretirement Benefit Plans [Line Items]
Operating and administrative expenses	$ 9,200us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = imkta_CashBonusesMember	$ 9,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = imkta_CashBonusesMember	$ 10,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = imkta_CashBonusesMember

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- Details

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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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- Details

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