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

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- Definition 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). + 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 FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35281-107843 + Details
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- Definition 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). + 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 FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6911-107765 + Details
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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within 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 FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e7018-107765 + Details
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