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Supplementary Balance Sheet Information (Accrued Expenses And Current Portion Of Other Long-Term Liabilities) (Details) (USD $)	Sep. 27, 2014	Sep. 28, 2013
Supplementary Balance Sheet Information [Line Items]
Property, payroll, and other taxes payable	$ 16,469,128us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent	$ 16,771,941us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Salaries, wages and bonuses payable	25,514,842us-gaap_AccruedSalariesCurrent	25,129,025us-gaap_AccruedSalariesCurrent
Interest	12,676,648us-gaap_InterestPayableCurrent	12,993,252us-gaap_InterestPayableCurrent
Other	3,349,190us-gaap_OtherAccruedLiabilitiesCurrent	4,264,622us-gaap_OtherAccruedLiabilitiesCurrent
Total	70,944,728us-gaap_OtherAccountsPayableAndAccruedLiabilities	72,002,983us-gaap_OtherAccountsPayableAndAccruedLiabilities
Employee Group Insurance [Member]
Supplementary Balance Sheet Information [Line Items]
Self-insurance liabilities	4,585,759us-gaap_AccruedInsuranceCurrent / us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis = imkta_EmployeeGroupInsuranceMember	4,591,256us-gaap_AccruedInsuranceCurrent / us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis = imkta_EmployeeGroupInsuranceMember
Workers Compensation Insurance [Member]
Supplementary Balance Sheet Information [Line Items]
Self-insurance liabilities	5,677,217us-gaap_AccruedInsuranceCurrent / us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis = imkta_WorkersCompensationInsuranceMember	5,658,840us-gaap_AccruedInsuranceCurrent / us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis = imkta_WorkersCompensationInsuranceMember
General Liability [Member]
Supplementary Balance Sheet Information [Line Items]
Self-insurance liabilities	$ 2,671,944us-gaap_AccruedInsuranceCurrent / us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis = us-gaap_GeneralLiabilityMember	$ 2,594,047us-gaap_AccruedInsuranceCurrent / us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis = us-gaap_GeneralLiabilityMember

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Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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