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Fair Values Of Financial Instruments (Carrying Amount And Fair Value Of Debt) (Details) - Level 2 [Member] $ in Thousands | Sep. 29, 2018 USD ($)
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Carrying Amount [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Total debt | $ 865,588
Fair Value [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Total debt | 876,088
Senior Notes [Member] | Carrying Amount [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Total debt | 700,000
Senior Notes [Member] | Fair Value [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Total debt | 710,500
Facility Bonds [Member] | Carrying Amount [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Total debt | 77,090
Facility Bonds [Member] | Fair Value [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Total debt | 77,090
Secured Notes Payable And Other [Member] | Carrying Amount [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Total debt | 88,498
Secured Notes Payable And Other [Member] | Fair Value [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Total debt | $ 88,498

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- 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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=imkta_FacilityBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=imkta_SecuredNotesPayableAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |