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Subsequent Events (Details Textual) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012 | Jan. 31, 2014 | Mar. 31, 2015
Restricted Stock Units (RSUs) |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of Shares, Restricted stock awards released | 46,759 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 17,249 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 15,189 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |
Number of Shares, Restricted stock units cancelled | 4,890 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 75,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |
Restricted Stock Units (RSUs) | Market Performance Award #1 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Period consider for calculation of average stock price performance prior awards vesting | 2 months |  |  |  |
Period consider for calculation of average stock price performance after awards vesting | 2 months |  |  |  |
Restricted Stock Units (RSUs) | Market Performance Award #2 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Period consider for calculation of average stock price performance prior awards vesting |  |  |  | 2 months |
Period consider for calculation of average stock price performance after awards vesting |  |  |  | 2 months |
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Period consider for calculation of average stock price performance prior awards vesting |  |  |  |  | 2 months
Period consider for calculation of average stock price performance after awards vesting |  |  |  |  | 2 months
Subsequent Event | Restricted Stock Units (RSUs) | Market Performance Award #1 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of Shares, Restricted stock awards released |  |  |  |  | 190,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = irix_AwardOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of Shares, Restricted stock units cancelled |  |  |  |  | 30,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = irix_AwardOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event | Restricted Stock Units (RSUs) | Market Performance Award #2 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of Shares, Restricted stock awards released |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = irix_AwardTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of Shares, Restricted stock units cancelled |  |  |  |  | 50,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = irix_AwardTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Period consider for calculation of average stock price performance after awards vesting. + References No definition available. + Details
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- Definition Period consider for calculation of average stock price performance prior awards vesting. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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