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Fair Values Of Financial Instruments (Details) (Level 2 [Member], USD $)
In Thousands, unless otherwise specified
Sep. 27, 2014
Carrying Amount [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt $ 937,260us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 943,175us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Senior Notes, Net Of Unamortized Original Issue Discount [Member] | Carrying Amount [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 700,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes, Net Of Unamortized Original Issue Discount [Member] | Fair Value [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 705,250us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Recovery Zone Facility Bonds [Member] | Carrying Amount [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 95,210us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= imkta_FacilityBondsMember
Recovery Zone Facility Bonds [Member] | Fair Value [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 95,210us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= imkta_FacilityBondsMember
Real Estate And Equipment Notes Payable [Member] | Carrying Amount [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 112,140us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= imkta_RealEstateAndEquipmentNotesPayableMember
Real Estate And Equipment Notes Payable [Member] | Fair Value [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 112,805us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= imkta_RealEstateAndEquipmentNotesPayableMember
Line Of Credit Payable [Member] | Carrying Amount [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 29,910us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Line Of Credit Payable [Member] | Fair Value [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt $ 29,910us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember