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Employee Benefit Plans - Schedule of Defined Benefit Plans Disclosures (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2022 | Dec. 31, 2021 | Jan. 01, 2021
Swiss Plan |  |  |  |
Change in Projected Benefit Obligation: |  |  |  |
Projected benefit obligation, beginning of period |  | $ 26,247 | $ 25,470 |
Service cost | [1] | 1,133 | 1,089 | $ 1,139
Interest cost | [2] | 82 | 55 | 51
Participant contributions |  | 772 | 678 |
Benefits deposited (paid) |  | 208 | 2,147 |
Actuarial (gain) loss |  | (6,979) | (1,875) |
Prior service credit |  | 0 | (1,317) |
Projected benefit obligation, end of period |  | 21,463 | 26,247 | 25,470
Change in Plan Assets: |  |  |  |
Plan assets at fair value, beginning of period |  | 18,809 | 15,551 |
Actual return on plan assets |  | 12 | (374) |
Employer contributions |  | 908 | 807 |
Participant contributions |  | 772 | 678 |
Benefits deposited (paid) |  | 208 | 2,147 |
Plan assets at fair value, end of period |  | 20,709 | 18,809 | 15,551
Funded status (pension liability), end of year | [3] | (754) | (7,438) |
Amount Recognized in Accumulated Other Comprehensive Income (Loss), net of tax: |  |  |  |
Actuarial loss on plan assets |  | (1,354) | (922) |
Actuarial loss on benefit obligation |  | (531) | (6,782) |
Actuarial gain (loss) recognized in current year |  | 1,847 | 1,499 |
Prior service credit |  | 1,283 | 1,443 |
Effect of curtailments |  | 610 | 610 |
Accumulated other comprehensive income (loss) |  | 1,855 | (4,152) |
Accumulated benefit obligation at year end |  | (20,784) | (25,179) |
Japan Plan |  |  |  |
Change in Projected Benefit Obligation: |  |  |  |
Projected benefit obligation, beginning of period |  | 1,320 | 2,021 |
Service cost | [1] | 116 | 177 | 180
Interest cost | [2] | 2 | 6 | 5
Benefits deposited (paid) |  | (46) | (425) |
Actuarial (gain) loss |  | (42) | (276) |
Foreign exchange adjustment |  | (169) | (183) |
Projected benefit obligation, end of period |  | 1,181 | 1,320 | 2,021
Change in Plan Assets: |  |  |  |
Plan assets at fair value, beginning of period |  | 0 | 0 |
Actual return on plan assets |  | 0 | 0 |
Employer contributions |  | 0 | 0 |
Plan assets at fair value, end of period |  | 0 | 0 | $ 0
Benefits paid |  | 0 | 0 |
Distribution of plan assets |  | 0 | 0 |
Foreign exchange adjustment |  | 0 | 0 |
Funded status (pension liability), end of year | [3] | (1,181) | (1,320) |
Amount Recognized in Accumulated Other Comprehensive Income (Loss), net of tax: |  |  |  |
Actuarial gain (loss) recognized in current year |  | (30) | (35) |
Prior service credit |  | 4 | 6 |
Net gain |  | 210 | 221 |
Accumulated other comprehensive income (loss) |  | 184 | 192 |
Accumulated benefit obligation at year end |  | $ (1,134) | $ (1,280) |
[1] | Recognized in selling general and administrative expenses on the Consolidated Statements of Income.
[2] | Recognized in other income (expense), net, on the Consolidated Statements of Income.
[3] | The underfunded balance was included in pension liability on the Consolidated Balance Sheets.

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- Definition Defined benefit plan accumulated other comprehensive income net actuarial gains (losses) after tax. + References No definition available. + Details
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- Definition Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale. + References No definition available. + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents decrease to plan assets. + References No definition available. + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents decrease to plan assets. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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Name: | us-gaap_RetirementPlanNameAxis=staa_JapanPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |