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v2.4.1.9

Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012
Segment Reporting Information [Line Items] |  |  |
Number of segments | 1 us-gaap_NumberOfReportableSegments |  |
Fluid Dairy [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | $ 58.7 imkta_IntercompanyEliminations / us-gaap_StatementBusinessSegmentsAxis = imkta_FluidDairyMember | $ 58.3 imkta_IntercompanyEliminations / us-gaap_StatementBusinessSegmentsAxis = imkta_FluidDairyMember | $ 58.5 imkta_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: |