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Stockholder's Equity (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Sep. 27, 2014 | Sep. 28, 2013
Class of Stock [Line Items] |  |
Percentage of cash dividend or liquidation payment based on Class B common stock | 110.00%imkta_PercentageOfCashDividendOrLiquidationPaymentOnClassBCommonStockPayableToOtherClassCommonStock |
Shares authorized for repurchase |  | 4,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Minimum [Member] |  |
Class of Stock [Line Items] |  |
Number of directors set by board of directors | 5 imkta_NumberOfDirectors / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] |  |
Class of Stock [Line Items] |  |
Number of directors set by board of directors | 11 imkta_NumberOfDirectors / us-gaap_RangeAxis = us-gaap_MaximumMember |
Class A Common Stock [Member] |  |
Class of Stock [Line Items] |  |
Number of votes per share held by common stock holders | 1 imkta_NumberOfVotesPerShareHeldByCommonStockHolders / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Percentage of directors to be elected by holders of common stock | 25.00%imkta_PercentageOfDirectorsToBeElectedByHoldersOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Class B Common Stock [Member] |  |
Class of Stock [Line Items] |  |
Number of votes per share held by common stock holders | 10 imkta_NumberOfVotesPerShareHeldByCommonStockHolders / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Minimum percentage of outstanding common stock of both classes represented by common stock | 12.50%imkta_PercentageOfCommonStockForClassBCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Shares authorized for repurchase | 2,500,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 1,500,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Shares repurchased during the period | 2,500,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |

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- Definition Percentage of cash dividend or liquidation payment on class B common stock payable to other class common stock. + References No definition available. + Details
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- Definition Percentage of directors to be elected by holders of common stock. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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