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Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended
	Dec. 27, 2014	Dec. 29, 2010
Debt Instrument [Line Items]
Maturity period of Senior note	2023
Redemption period of senior notes	redeem all or a portion of the Notes at any time on or after June 15, 2018
Amount of line of credit arrangement	$ 175,000,000imkta_LineOfCreditEnteredForNotesOffering
Final maturity date of bonds	Jan. 01, 2036
Redemption period of bonds	Jan. 01, 2014
Description of interest rate on bonds	interest rate on the bonds is equal to one month LIBOR (adjusted monthly) plus a credit spread
Principal amount	700,000,000us-gaap_DebtInstrumentFaceAmount
Interest rate of Senior note	5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
Unused letters of credit issued	11,500,000us-gaap_LettersOfCreditOutstandingAmount
Total amount of bonds funded		99,700,000us-gaap_DebtInstrumentCarryingAmount
Annual amount of redemption of bonds	4,530,000imkta_MandatoryRedemptionOfBondsAnnualAmount
Repayment of line of credit	52,000,000us-gaap_RepaymentsOfLongTermLinesOfCredit
Redemption of senior notes, date	Jun. 15, 2018
Maximum amount of unused letters of credit allowed to issue	30,000,000imkta_LetterOfCreditMaximumLimitAllowableForIssue
Line of credit outstanding	65,000,000us-gaap_LineOfCreditFacilityAmountOutstanding
Senior Notes Maturing 2017 [Member]
Debt Instrument [Line Items]
Maturity period of Senior note	2017
Principal amount	$ 575,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = imkta_SeniorNotesMaturing2017Member

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- Definition

Debt Instrument, Earliest Date of Redemption

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- Definition

Letter of credit maximum limit allowable for issue.

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- Definition

Line of credit entered for notes offering.

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- Definition

Mandatory redemption of bonds annual amount.

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Maturity period of senior note.

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount borrowed under the credit facility as of the balance sheet date.

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