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Employee Benefit Plans (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 02, 2015	Jan. 03, 2014	Dec. 28, 2012
Swiss Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year actuarial gain (loss) on plan assets, net of tax	$ (375)staa_OtherComprehensiveIncomeLossActuarialGainLossOnPlanassets / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	$ 37staa_OtherComprehensiveIncomeLossActuarialGainLossOnPlanassets / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	$ 50staa_OtherComprehensiveIncomeLossActuarialGainLossOnPlanassets / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember
Current year actuarial gain (loss) on benefit obligation, net of tax	(846)staa_OtherComprehensiveIncomeLossActuarialGainLossOnBenefitObligations / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	135staa_OtherComprehensiveIncomeLossActuarialGainLossOnBenefitObligations / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	(101)staa_OtherComprehensiveIncomeLossActuarialGainLossOnBenefitObligations / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember
Actuarial gain recorded in current year, net of tax	28staa_OtherComprehensiveIncomeLossActuarialGainLossOfCurrentYear / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	46staa_OtherComprehensiveIncomeLossActuarialGainLossOfCurrentYear / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	42staa_OtherComprehensiveIncomeLossActuarialGainLossOfCurrentYear / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember
Prior service cost	0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember
Effect of curtailments	782staa_OtherComprehensiveIncomeLossActuarialGainLossEffectOfCurtailments / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	0staa_OtherComprehensiveIncomeLossActuarialGainLossEffectOfCurtailments / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	0staa_OtherComprehensiveIncomeLossActuarialGainLossEffectOfCurtailments / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember
Change in other comprehensive income (loss)	(411)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	218us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember	(9)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementGeographicalAxis = staa_SwissPlanMember
Japan Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of net transition obligation	12us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember	12us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember	16us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember
Amortization of actuarial loss	(9)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember	(47)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember	(62)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember
Actuarial gain recorded in current year, net of tax	13staa_OtherComprehensiveIncomeLossActuarialGainLossOfCurrentYear / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember	(153)staa_OtherComprehensiveIncomeLossActuarialGainLossOfCurrentYear / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember	(117)staa_OtherComprehensiveIncomeLossActuarialGainLossOfCurrentYear / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember
Prior service cost	(2)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember	(1)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember	(1)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember
Change in other comprehensive income (loss)	$ 14us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember	$ (189)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember	$ (127)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementGeographicalAxis = staa_JapanPlanMember

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- Definition

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+ References

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- Definition

Reflects the amount of actuarial gain (loss) on benefit obligations of current year.

+ References

No definition available.

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- Definition

Reflects the amount of actuarial gain (loss) on plan assets of current year.

+ References

No definition available.

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- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

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- Definition

Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity.

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Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for net transition asset (obligation) related to pension and other postretirement benefit plans.

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