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Note 14 - Business Segment Information - Net Sales By Product Line (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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

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

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