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Employee Benefit Plans - Schedule of Defined Benefit Plans Disclosures (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Jan. 01, 2021 | Jan. 03, 2020
Swiss Plan |  |  |  |
Change in Projected Benefit Obligation: |  |  |  |
Projected benefit obligation, beginning of period |  | $ 25,470 | $ 12,864 |
Service cost | [1] | 1,089 | 1,139 | $ 739
Interest cost | [2] | 55 | 51 | 77
Participant contributions |  | 678 | 579 |
Benefits deposited (paid) |  | 2,147 | 6,299 |
Actuarial (gain) loss |  | (1,875) | 4,620 |
Prior service credit |  | (1,317) | (82) |
Projected benefit obligation, end of period |  | 26,247 | 25,470 | 12,864
Change in Plan Assets: |  |  |  |
Plan assets at fair value, beginning of period |  | 15,551 | 6,774 |
Actual return on plan assets |  | (374) | 1,195 |
Employer contributions |  | 807 | 704 |
Participant contributions |  | 678 | 579 |
Benefits deposited (paid) |  | 2,147 | 6,299 |
Plan assets at fair value, end of period |  | 18,809 | 15,551 | 6,774
Funded status (pension liability), end of year | [3] | (7,438) | (9,919) |
Amount Recognized in Accumulated Other Comprehensive Income (Loss), net of tax: |  |  |  |
Actuarial loss on plan assets |  | (922) | (198) |
Actuarial loss on benefit obligation |  | (6,782) | (8,453) |
Actuarial gain (loss) recognized in current year |  | 1,499 | 1,029 |
Prior service credit |  | 1,443 | 301 |
Effect of curtailments |  | 610 | 610 |
Accumulated other comprehensive income (loss) |  | (4,152) | (6,711) |
Accumulated benefit obligation at year end |  | (25,179) | (24,291) |
Japan Plan |  |  |  |
Change in Projected Benefit Obligation: |  |  |  |
Projected benefit obligation, beginning of period |  | 2,021 | 1,750 |
Service cost | [1] | 177 | 180 | 185
Interest cost | [2] | 6 | 5 | 7
Benefits deposited (paid) |  | (425) | (35) |
Actuarial (gain) loss |  | (276) | 34 |
Foreign exchange adjustment |  | (183) | 87 |
Projected benefit obligation, end of period |  | 1,320 | 2,021 | 1,750
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] | (1,320) | (2,021) |
Amount Recognized in Accumulated Other Comprehensive Income (Loss), net of tax: |  |  |  |
Actuarial gain (loss) recognized in current year |  | (35) | (38) |
Prior service credit |  | 6 | 7 |
Net gain |  | 221 | 46 |
Accumulated other comprehensive income (loss) |  | 192 | 15 |
Accumulated benefit obligation at year end |  | $ (1,280) | $ (1,858) |
[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 Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change plan asset value 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 http://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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 + Details
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Name: | us-gaap_RetirementPlanNameAxis=staa_JapanPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |