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Pension Plans (Details Textual) (Swiss Plan [Member], USD $)	3 Months Ended
	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	$ 400,200us-gaap_DefinedBenefitPlanContributionsByEmployer / staa_AllCountriesAxis = staa_SwissPlanMember	$ 558,000us-gaap_DefinedBenefitPlanContributionsByEmployer / staa_AllCountriesAxis = staa_SwissPlanMember

X

- 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

X

- Details

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