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v2.4.1.9

Long-Term Debt (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 29, 2013 | Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012 | Dec. 29, 2010 sqft
Debt Instrument [Line Items] |  |  |  |  |
Payments on line of credit | $ 52,000,000 us-gaap_RepaymentsOfLinesOfCredit | $ 383,927,017 us-gaap_RepaymentsOfLinesOfCredit | $ 622,051,131 us-gaap_RepaymentsOfLinesOfCredit | $ 741,446,238 us-gaap_RepaymentsOfLinesOfCredit |
Unamortized loan expense | 15,300,000 imkta_UnamortizedLoanExpense |  |  |  |
Line of credit facility |  | 175,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |
Maximum amount of unused letters of credit issued |  | 30,000,000 imkta_UnusedLettersOfCreditAllowedToIssue |  |  |
Unused letters of credit issued |  | 11,000,000 us-gaap_LettersOfCreditOutstandingAmount |  |  |
Total amount of bonds funded |  |  |  |  | 99,700,000 us-gaap_DebtInstrumentCarryingAmount
Total area of new warehouse and distribution center |  |  |  |  | 830,000 us-gaap_AreaOfLand
Annual amount of redemption of bonds |  | 4,500,000 imkta_MandatoryRedemptionOfBondsAnnualAmount |  |  |
Property and equipment with undepreciated cost pledge as collateral for long term debt |  | 273,000,000 imkta_PropertyAndEquipmentWithUndepreciatedCostPledgeAsCollateralForLongTermDebt |  |  |
Line of credit outstanding |  | 29,910,050 us-gaap_LineOfCreditFacilityAmountOutstanding |  |  |
Senior Notes, Interest Rate Of 5.75%, Maturing 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 700,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = imkta_SeniorNotes1Member |  |  |  |
Interest rate of Senior note |  | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = imkta_SeniorNotes1Member |  |  |

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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 -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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