XML 65 R53.htm IDEA: XBRL DOCUMENT
v3.21.2

Stockholder's Equity (Narrative) (Details) | 12 Months Ended
--- | ---
Sep. 25, 2021 item
Class of Stock [Line Items] |
Number of classes of common stock | 2
Percentage of cash dividend or liquidation payment based on Class B common stock | 110.00%
Minimum [Member] |
Class of Stock [Line Items] |
Number of directors that can be set by board of directors | 5
Maximum [Member] |
Class of Stock [Line Items] |
Number of directors that can be set by board of directors | 11
Class A Common Stock |
Class of Stock [Line Items] |
Number of votes per share held by common stock holders | 1
Percentage of directors to be elected by holders of common stock | 25.00%
Class B Common Stock [Member] |
Class of Stock [Line Items] |
Number of votes per share held by common stock holders | 10
Minimum percentage of outstanding common stock of both classes represented by common stock | 12.50%

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 directors. + References No definition available. + Details
Name: | imkta_NumberOfDirectors
Namespace Prefix: | imkta_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Percentage of cash dividend or liquidation payment on class B common stock payable to other class common stock. + References No definition available. + Details
Name: | imkta_PercentageOfCashDividendOrLiquidationPaymentOnClassBCommonStockPayableToOtherClassCommonStock
Namespace Prefix: | imkta_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of common stock for class B common stock. + References No definition available. + Details
Name: | imkta_PercentageOfCommonStockForClassBCommonStock
Namespace Prefix: | imkta_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of directors to be elected by holders of common stock. + References No definition available. + Details
Name: | imkta_PercentageOfDirectorsToBeElectedByHoldersOfCommonStock
Namespace Prefix: | imkta_
Data Type: | num:percentItemType
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_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |