XML 49 R38.htm IDEA: XBRL DOCUMENT v3.21.2

Segment Information (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 26, 2021 USD ($)	Jun. 27, 2020 USD ($)	Jun. 26, 2021 USD ($) segment	Jun. 27, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			1
Fluid dairy [Member]
Segment Reporting Information [Line Items]
Sales eliminated in consolidation | $	$ 11.1	$ 11.2	$ 34.8	$ 35.0

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ 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: