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Business Segments - Revenue Information by Geographic Region (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Apr. 04, 2015 | Mar. 29, 2014
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Total revenues | $ 10,796 us-gaap_Revenues | $ 10,329 us-gaap_Revenues
United States |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Total revenues | 5,581 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 4,705 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Europe |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Total revenues | 2,314 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 2,303 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Rest of Americas |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Total revenues | 996 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = irix_RestOfAmericasMember | 838 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = irix_RestOfAmericasMember
Asia/Pacific Rim |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Total revenues | $ 1,905 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | $ 2,483 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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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- Details
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- Details
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- Details
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