Cash Flow Information (Details) - USD ($)	12 Months Ended
Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Cash Flow Information [Abstract]
Interest (net of amounts capitalized)	$ 47,059,731	$ 46,886,468	$ 65,281,861
Income taxes	37,198,075	32,064,452	(2,470,362)
Property and equipment additions included in accounts payable	$ 1,192,232	$ 8,555,952	$ 14,598,996

Non cash or part non cash acquisition value of property and equipment acquired included in accounts payable.

No definition available.

Name:	imkta_NonCashOrPartNonCashAcquisitionValueOfPropertyAndEquipmentAcquiredIncludedInAccountsPayable
Namespace Prefix:	imkta_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

+ Details

Name:	us-gaap_IncomeTaxesPaidNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

+ References

+ Details

Name:	us-gaap_InterestPaidNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration