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Stockholder's Equity (Narrative) (Details)	12 Months Ended
	Sep. 28, 2013
Class of Stock [Line Items]
Percentage of cash dividend or liquidation payment based on Class B common stock	110.00%
Shares authorized for repurchase	4,000,000
Minimum [Member]
Class of Stock [Line Items]
Number of directors set by board of directors	5
Maximum [Member]
Class of Stock [Line Items]
Number of directors set by board of directors	11
Class A Common Stock [Member]
Class of Stock [Line Items]
Number of votes per share held by common stock holders	1
Percentage of directors to be elected by holders of common stock	25.00%
Class B Common Stock [Member]
Class of Stock [Line Items]
Number of votes per share held by common stock holders	10
Minimum percentage of outstanding common stock of both classes represented by common stock	12.50%
Shares authorized for repurchase	1,500,000
Shares repurchased during the period	1,500,000

X

- Definition

Number of directors.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Number of votes per share held by common stock holders.

+ References

No definition available.

+ Details

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Namespace Prefix:	imkta_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- 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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Namespace Prefix:	imkta_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of common stock for class B common stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	imkta_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of directors to be elected by holders of common stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	imkta_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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Period Type:	instant