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Segment Information (Narrative) (Details) (Fluid Dairy [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Fluid Dairy [Member]
Segment Reporting Information [Line Items]
Sales	$ 12.4imkta_IntercompanyEliminations / us-gaap_StatementBusinessSegmentsAxis = imkta_FluidDairyMember	$ 15.3imkta_IntercompanyEliminations / us-gaap_StatementBusinessSegmentsAxis = imkta_FluidDairyMember	$ 27.0imkta_IntercompanyEliminations / us-gaap_StatementBusinessSegmentsAxis = imkta_FluidDairyMember	$ 30.1imkta_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

- Details

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