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Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 02, 2015	Jan. 03, 2014	Dec. 28, 2012
Computed provision (benefit) for taxes based on income at statutory rate percentage	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Computed provision (benefit) for taxes based on income at statutory rate	$ (2,939)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 379us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (176)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) in taxes resulting from:
Permanent differences percentage	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	3.20%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(7.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Federal minimum taxes percentage	(0.10%)staa_EffectiveIncomeTaxrateReconciliationAtFederalMinimumIncomeTaxRate	0.00%staa_EffectiveIncomeTaxrateReconciliationAtFederalMinimumIncomeTaxRate	0.00%staa_EffectiveIncomeTaxrateReconciliationAtFederalMinimumIncomeTaxRate
State minimum taxes, net of federal income tax benefit percentage	(0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	(1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Stock options percentage	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	(56.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
State tax benefit percentage	4.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesStateAndLocal	6.40%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesStateAndLocal	9.20%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesStateAndLocal
Tax rate difference due to foreign statutory rate percentage	3.30%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign	43.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign	(43.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign
Foreign tax detriment (benefit) percentage	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign	3.10%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Foreign earnings not permanently reinvested percentage	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	(7.70%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	(223.40%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
Foreign dividend withholding percentage	(1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends	12.50%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends	(22.10%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends
Expiration of charitable contribution carryover percentage	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions	0.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions	(16.10%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions
Reserve percentage	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther	(10.90%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
Other percentage	1.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	6.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	1.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Valuation allowance percentage	(38.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(24.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	83.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective tax provision (benefit) rate percentage	2.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations	64.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations	(240.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Permanent differences	20us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	35us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	41us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Federal minimum taxes	3staa_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalMinimumIncomeTaxRate	0staa_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalMinimumIncomeTaxRate	0staa_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalMinimumIncomeTaxRate
State minimum taxes, net of federal income tax benefit	10us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	8us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	8us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Stock options	0us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	290us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
State tax benefit	(394)us-gaap_IncomeTaxReconciliationTaxContingenciesStateAndLocal	71us-gaap_IncomeTaxReconciliationTaxContingenciesStateAndLocal	(48)us-gaap_IncomeTaxReconciliationTaxContingenciesStateAndLocal
Tax rate difference due to foreign statutory rate	(288)us-gaap_IncomeTaxReconciliationTaxContingenciesForeign	487us-gaap_IncomeTaxReconciliationTaxContingenciesForeign	227us-gaap_IncomeTaxReconciliationTaxContingenciesForeign
Foreign tax detriment (benefit)	0us-gaap_IncomeTaxReconciliationTaxCreditsForeign	0us-gaap_IncomeTaxReconciliationTaxCreditsForeign	(16)us-gaap_IncomeTaxReconciliationTaxCreditsForeign
Foreign earnings not permanently reinvested	(11)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings	(86)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings	1,158us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Foreign dividend withholding	132us-gaap_IncomeTaxReconciliationDeductionsDividends	140us-gaap_IncomeTaxReconciliationDeductionsDividends	114us-gaap_IncomeTaxReconciliationDeductionsDividends
Expiration of charitable contribution carryover	18us-gaap_IncomeTaxReconciliationNondeductibleExpenseCharitableContributions	2us-gaap_IncomeTaxReconciliationNondeductibleExpenseCharitableContributions	83us-gaap_IncomeTaxReconciliationNondeductibleExpenseCharitableContributions
Reserve	0us-gaap_IncomeTaxReconciliationDeductionsOther	(121)us-gaap_IncomeTaxReconciliationDeductionsOther	0us-gaap_IncomeTaxReconciliationDeductionsOther
Other	(85)us-gaap_IncomeTaxReconciliationOtherAdjustments	71us-gaap_IncomeTaxReconciliationOtherAdjustments	(6)us-gaap_IncomeTaxReconciliationOtherAdjustments
Valuation allowance	3,281us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(270)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(431)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective tax provision (benefit) rate	$ (253)us-gaap_IncomeTaxExpenseBenefit	$ 716us-gaap_IncomeTaxExpenseBenefit	$ 1,244us-gaap_IncomeTaxExpenseBenefit

X

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The domestic federal minimum tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal minimum tax rates to pretax income from continuing operations.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to charitable contributions expense.

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