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Long-Term Debt (Schedule Of Long-Term Debt And Short-Term Loans) (Details) (USD $) | Sep. 27, 2014 | Sep. 28, 2013
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Debt Instrument [Line Items] |  |
Outstanding line of credit, weighted average interest rate of 3.99% | $ 29,910,050 us-gaap_LineOfCreditFacilityAmountOutstanding |
Total long-term debt | 937,259,743 us-gaap_LongTermDebt | 912,470,999 us-gaap_LongTermDebt
Less current portion | 12,488,400 us-gaap_LongTermDebtCurrent | 18,956,761 us-gaap_LongTermDebtCurrent
Long-term debt, net of current portion | 924,771,343 us-gaap_LongTermDebtNoncurrent | 893,514,238 us-gaap_LongTermDebtNoncurrent
Weighted average interest rate | 3.38%us-gaap_DebtWeightedAverageInterestRate |
Senior Notes, Interest Rate Of 5.75%, Maturing 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Bonds payable | 700,000,000 imkta_LongTermBondsPayable / us-gaap_LongtermDebtTypeAxis = imkta_SeniorNotes1Member | 700,000,000 imkta_LongTermBondsPayable / us-gaap_LongtermDebtTypeAxis = imkta_SeniorNotes1Member
Interest rate | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = imkta_SeniorNotes1Member |
Recovery Zone Facility Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Bonds payable | 95,210,000 imkta_LongTermBondsPayable / us-gaap_LongtermDebtTypeAxis = imkta_FacilityBondsMember | 99,740,000 imkta_LongTermBondsPayable / us-gaap_LongtermDebtTypeAxis = imkta_FacilityBondsMember
Due to Banks, Weighted Average Interest Rate of 3.01 for 2014 and 3.26% for 2013 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | 80,634,003 us-gaap_LongTermNotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember | 78,405,127 us-gaap_LongTermNotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
Weighted average interest rate | 3.01%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember | 3.26%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
Due to Other Financial Institutions, Weighted Average Interest Rate of 4.09% for 2014 and 4.04% for 2013 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 31,505,690 us-gaap_LongTermNotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | $ 34,325,872 us-gaap_LongTermNotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Weighted average interest rate | 4.09%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 4.04%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember

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- Definition Long Term Bonds Payable + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + 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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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 + Details
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