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Earnings Per Common Share (Narrative) (Details)	3 Months Ended
	Dec. 27, 2014
Earnings Per Share [Line Items]
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%imkta_PercentageOfCashDividendOnClassBCommonStockEntitledToReceiveForEachShareOfClassCommonStock
Class A Common Stock [Member]
Earnings Per Share [Line Items]
Number of votes for common stock	1imkta_NumberOfVotesForCommonStockHolders / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class B Common Stock [Member]
Earnings Per Share [Line Items]
Number of votes for common stock	10imkta_NumberOfVotesForCommonStockHolders / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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- Definition

Number of votes for common stock holders.

+ References

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- Definition

Percentage of cash dividend on Class B common stock entitled to receive for each share of Class A common stock.

+ References

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- Definition

Basis of conversion of convertible common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

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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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

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