XML 85 R71.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Note 13 - Business Segment Information - Net Sales By Product Line (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Oct. 03, 2015
Revenue | $ 388,871 | $ 418,547 | $ 447,504
Welded Wire Reinforcement [Member] |  |  |
Revenue | 239,522 | 256,801 | 255,219
PC Strand [Member] |  |  |
Revenue | $ 149,349 | $ 161,746 | $ 192,285

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=63488584&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: |