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Note 14 - Business Segment Information (Details) - Net Sales By Product Line (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012
Net sales: |  |  |
Revenue | $ 408,978 | $ 363,896 | $ 363,303
Welded Wire Reinforcement [Member] |  |  |
Net sales: |  |  |
Revenue | 255,294 | 227,957 | 230,049
PC Strand [Member] |  |  |
Net sales: |  |  |
Revenue | $ 153,684 | $ 135,939 | $ 133,254

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- Details
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Namespace Prefix: | iiin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration