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Note 6 - Fair Value Measurements (Details) - Fair Value of Financial Assets (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Sep. 28, 2013
Current assets:
Cash Equivalents	$ 3,320	$ 15,534
Other assets:
Cash surrender value of life insurance policies	6,867	6,145
Total	10,187	21,679
Fair Value, Inputs, Level 1 [Member]
Current assets:
Cash Equivalents	3,320	15,534
Other assets:
Total	3,320	15,534
Fair Value, Inputs, Level 2 [Member]
Other assets:
Cash surrender value of life insurance policies	6,867	6,145
Total	$ 6,867	$ 6,145

X

- Details

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Namespace Prefix:	iiin_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Surrender Value

-URI http://asc.fasb.org/extlink&oid=6507153

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