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Related Party Transactions (Narrative) (Details) - Robert P. Ingle II, Chairman of Board [Member] $ in Millions	1 Months Ended
	Nov. 30, 2019 USD ($) item
Related Party Transaction [Line Items]
Number of land parcels sold | item	2
Related party transaction, other revenues from transactions with related party | $	$ 4.3

X

- Definition

Number Of Land Parcels Sold

+ References

No definition available.

+ Details

Name:	imkta_NumberOfLandParcelsSold
Namespace Prefix:	imkta_
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_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=imkta_ChairmanOfBoardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: