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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