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Long-Term Debt (Schedule Of Long-Term Debt And Short-Term Loans) (Details) (USD $)	Sep. 27, 2014	Sep. 28, 2013
Debt Instrument [Line Items]
Outstanding line of credit, weighted average interest rate of 3.99%	$ 29,910,050us-gaap_LineOfCreditFacilityAmountOutstanding
Total long-term debt	937,259,743us-gaap_LongTermDebt	912,470,999us-gaap_LongTermDebt
Less current portion	12,488,400us-gaap_LongTermDebtCurrent	18,956,761us-gaap_LongTermDebtCurrent
Long-term debt, net of current portion	924,771,343us-gaap_LongTermDebtNoncurrent	893,514,238us-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	700,000,000imkta_LongTermBondsPayable / us-gaap_LongtermDebtTypeAxis = imkta_SeniorNotes1Member	700,000,000imkta_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	95,210,000imkta_LongTermBondsPayable / us-gaap_LongtermDebtTypeAxis = imkta_FacilityBondsMember	99,740,000imkta_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	80,634,003us-gaap_LongTermNotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember	78,405,127us-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	$ 31,505,690us-gaap_LongTermNotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember	$ 34,325,872us-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

X

- Definition

Long Term Bonds Payable

+ References

No definition available.

+ Details

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X

- 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

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X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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X

- 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

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X

- 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

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-Publisher SEC

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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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

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-Topic 210

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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

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

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X

- Definition

Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

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