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Note 14 - Business Segment Information - Net Sales By Product Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Sep. 28, 2013
Welded Wire Reinforcement [Member]
Revenue	$ 255,219	$ 255,294	$ 227,957
PC Strand [Member]
Revenue	192,285	153,684	135,939
Revenue	$ 447,504	$ 408,978	$ 363,896

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_ProductOrServiceAxis=iiin_WeldedWireReinforcementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=iiin_PCStrandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: