XML 43 R32.htm IDEA: XBRL DOCUMENT
v3.21.1

Earnings Per Common Share (Narrative) (Details) | 6 Months Ended
--- | ---
Mar. 27, 2021 item
Earnings Per Share [Line Items] |
Number of classes of common stock | 2
Conversion feature for Class B Common Stock | each share is convertible into one share of Class A Common Stock at any time
Voting rights for shareholders | Each share of Class A Common Stock has one vote per share and each share of Class B Common Stock has ten votes per share
Percentage of cash dividend on Class B Common Stock entitled to receive for each share of Class A Common Stock | 110.00%
Class A Common Stock [Member] |
Earnings Per Share [Line Items] |
Number of votes for common stock | 1
Class B Common Stock [Member] |
Earnings Per Share [Line Items] |
Number of votes for common stock | 10

X
- Definition Earnings Per Share [Line Items] + References No definition available. + Details
Name: | imkta_EarningsPerShareLineItems
Namespace Prefix: | imkta_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Classes Of Common Stock + References No definition available. + Details
Name: | imkta_NumberOfClassesOfCommonStock
Namespace Prefix: | imkta_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of votes for common stock holders. + References No definition available. + Details
Name: | imkta_NumberOfVotesForCommonStockHolders
Namespace Prefix: | imkta_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of cash dividend on Class B common stock entitled to receive for each share of Class A common stock. + References No definition available. + Details
Name: | imkta_PercentageOfCashDividendOnClassBCommonStockEntitledToReceiveForEachShareOfClassCommonStock
Namespace Prefix: | imkta_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of common stock conversion feature. Includes, but is not limited to, conversion price; conversion right; timing of right; terms, event or change in circumstance causing contingency to be met or adjustment to conversion price or number of shares; manner of settlement upon conversion; and method of settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 + Details
Name: | us-gaap_CommonStockConversionFeatures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
Name: | us-gaap_CommonStockVotingRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |