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Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Segment Reporting Information [Line Items]
Number of segments			1
Increase in net sales from shopping center rentals		$ 2.1		$ 6.3
Increase in cost of goods sold from shopping center rentals		1.8		5.4
Fluid Dairy [Member]
Segment Reporting Information [Line Items]
Sales	$ 14.4	$ 13.4	$ 44.5	$ 44.1

X

- Definition

Increase in Cost of Goods Sold from Shopping Center Rentals

+ References

No definition available.

+ Details

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X

- Definition

Increase in Net Sales from Shopping Center Rentals

+ References

No definition available.

+ Details

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Namespace Prefix:	imkta_
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X

- Definition

Intercompany eliminations.

+ References

No definition available.

+ Details

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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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- Details

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