XML 19 R30.htm IDEA: XBRL DOCUMENT v2.4.0.6

Dividends - Additional Information (Detail) (USD $)	1 Months Ended				3 Months Ended		6 Months Ended		1 Months Ended		3 Months Ended		6 Months Ended		1 Months Ended
	Dec. 31, 2012	Oct. 25, 2012	Dec. 31, 2012 Class A Common Stock	Oct. 25, 2012 Class A Common Stock	Mar. 30, 2013 Class A Common Stock	Mar. 24, 2012 Class A Common Stock	Mar. 30, 2013 Class A Common Stock	Mar. 24, 2012 Class A Common Stock	Dec. 31, 2012 Class B Common Stock	Oct. 25, 2012 Class B Common Stock	Mar. 30, 2013 Class B Common Stock	Mar. 24, 2012 Class B Common Stock	Mar. 30, 2013 Class B Common Stock	Mar. 24, 2012 Class B Common Stock	Dec. 07, 2012 Special Dividend	Dec. 07, 2012 Special Dividend Class A Common Stock	Dec. 07, 2012 Special Dividend Class B Common Stock
Dividends [Line Items]
Cash dividends per share of common stock					$ 0.990	$ 0.165	$ 0.99	$ 0.33			$ 0.900	$ 0.150	$ 0.90	$ 0.30		$ 0.66	$ 0.60
Cash dividend paid per share			$ 0.165	$ 0.165					$ 0.15	$ 0.15
Dividend payment date		Oct. 25, 2012													Dec. 31, 2012
Dividend record date	Dec. 21, 2012	Oct. 11, 2012													Dec. 21, 2012

X

- Details

Name:	imkta_DividendsLineItems
Namespace Prefix:	imkta_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate dividends paid 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_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
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

X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

Name:	us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration