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Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 27, 2014	Dec. 28, 2013
Segment Reporting Information [Line Items]
Number of segments	1us-gaap_NumberOfReportableSegments
Fluid Dairy [Member]
Segment Reporting Information [Line Items]
Sales	$ 14.6imkta_IntercompanyEliminations / us-gaap_StatementBusinessSegmentsAxis = imkta_FluidDairyMember	$ 14.8imkta_IntercompanyEliminations / us-gaap_StatementBusinessSegmentsAxis = imkta_FluidDairyMember

X

- Definition

Intercompany eliminations.

+ References

No definition available.

+ Details

Name:	imkta_IntercompanyEliminations
Namespace Prefix:	imkta_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=imkta_FluidDairyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: