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Income Taxes (Schedule Of Income Tax Expense Reconciliation) (Details) (USD $)	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Income Taxes [Abstract]
Federal tax at statutory rate	$ 27,922,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 9,109,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 23,572,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income tax, net of federal tax benefits	2,308,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	(2,204,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1,943,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Federal tax credits	(718,000)imkta_IncomeTaxReconciliationTaxCreditsFederal	(1,410,000)imkta_IncomeTaxReconciliationTaxCreditsFederal	(1,209,000)imkta_IncomeTaxReconciliationTaxCreditsFederal
Other	(1,162,000)us-gaap_IncomeTaxReconciliationOtherAdjustments	(48,000)us-gaap_IncomeTaxReconciliationOtherAdjustments	(403,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense	$ 28,350,000us-gaap_IncomeTaxExpenseBenefit	$ 5,447,000us-gaap_IncomeTaxExpenseBenefit	$ 23,903,000us-gaap_IncomeTaxExpenseBenefit

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Income tax reconciliation tax credits federal.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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-Publisher SEC

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-Number 210

-Section 08

-Paragraph h

-Article 4



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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