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Employee Benefit Plan (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 29, 2012
Employee Benefit Plan (Textual) [Abstract] |
Defined Contribution Plan Employee Contribution Percentage | 15.00%
Employee contributions to plan in percentage | 50.00%
Maximum [Member] |
Employee Benefit Plan (Textual) [Abstract] |
Employee contributions to plan | 3

X
- Definition Defined contribution plan employee contribution percentage. + References No definition available. + Details
Name: | irix_DefinedContributionPlanEmployeeContributionPercentage
Namespace Prefix: | irix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | irix_EmployeeBenefitPlanTextualAbstract
Namespace Prefix: | irix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration