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Pension Plans (Details Textual) (Swiss Plan [Member], USD $) | 3 Months Ended
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Apr. 03, 2015 | Apr. 04, 2014
Swiss Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Contributions By Employer | $ 400,200 us-gaap_DefinedBenefitPlanContributionsByEmployer / staa_AllCountriesAxis = staa_SwissPlanMember | $ 558,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / staa_AllCountriesAxis = staa_SwissPlanMember

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration