XML 88 R69.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Subsequent Events (Details Textual) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Sep. 29, 2012 Class A Common Stock [Member] | Sep. 24, 2011 Class A Common Stock [Member] | Sep. 25, 2010 Class A Common Stock [Member] | Dec. 31, 2012 Class A Common Stock [Member] Subsequent Event [Member] | Sep. 29, 2012 Class B Common Stock [Member] | Sep. 24, 2011 Class B Common Stock [Member] | Sep. 25, 2010 Class B Common Stock [Member] | Dec. 31, 2012 Class B Common Stock [Member] Subsequent Event [Member]
Subsequent Events (Textual) [Abstract] |  |  |  |  |  |  |  |
Dividend declared | $ 0.66 | $ 0.66 | $ 0.66 | $ 0.66 | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.60

X
- Details
Name: | imkta_SubsequentEventsTextualAbstract
Namespace Prefix: | imkta_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + 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 S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration