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STOCK - BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2023 shares | Nov. 23, 2021 performance_based_milestone_target shares | Sep. 07, 2021 milestone shares | Oct. 31, 2021 shares | Sep. 28, 2025 USD ($) $ / shares shares | Sep. 29, 2024 USD ($) | Mar. 31, 2026 USD ($) | Jun. 26, 2022 | Sep. 28, 2025 USD ($) $ / shares shares | Sep. 29, 2024 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Total stock-based compensation | $ |  |  |  |  | $ 5,811 | $ 9,685 |  |  | $ 24,032 | $ 30,214
Weighted average grant date fair value of options (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 9.23 | $ 9.32
Options modified |  |  |  |  | 924,097 |  |  |  |  |
Modified options, weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 10.39 |  |  |  | $ 10.39 |
Performance based milestone targets | milestone |  |  | 3 |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual life |  |  |  |  |  |  |  | 10 years |  |
Total stock-based compensation | $ |  |  |  |  | $ 2,790 | 3,107 |  |  | $ 8,601 | $ 8,401
Unrecognized compensation expense | $ |  |  |  |  | 26,900 |  |  |  | $ 26,900 |
Expected period for recognition |  |  |  |  |  |  |  |  | 2 years 1 month 13 days |
Stock Options | Forecast |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Incremental cost | $ |  |  |  |  |  |  | $ 1,800 |  |  |
PSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Total stock-based compensation | $ |  |  |  |  | 1,981 | 4,669 |  |  | $ 7,840 | $ 15,168
Unrecognized compensation expense | $ |  |  |  |  | $ 1,900 |  |  |  | $ 1,900 |
Expected period for recognition |  |  |  |  |  |  |  |  | 3 months 25 days |
Outstanding shares |  |  |  |  | 4,500,000 |  |  |  | 4,500,000 |
Shares granted (in shares) |  |  |  | 6,300,000 |  |  |  |  |  | 0
New shares issued (in shares) |  | 321,428 |  |  |  |  |  |  |  |
Performance based milestone targets | performance_based_milestone_target |  | 3 |  |  |  |  |  |  |  |
Total shares granted (in shares) |  |  |  |  |  |  |  |  | 85,395 |
Released (in shares) |  |  |  |  |  |  |  |  |  | 900,000
PSUs | Founder One |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  | 2,100,000 |  |  |  |  |  |
PSUs | Founder Two |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  | 2,100,000 |  |  |  |  |  |
PSUs | Founder Three |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  | 2,100,000 |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Total stock-based compensation | $ |  |  |  |  | $ 1,040 | $ 1,909 |  |  | $ 7,591 | $ 6,645
Unrecognized compensation expense | $ |  |  |  |  | $ 7,500 |  |  |  | $ 7,500 |
Expected period for recognition |  |  |  |  |  |  |  |  | 2 years 1 month 13 days |
Shares granted (in shares) |  |  |  |  |  |  |  |  | 458,281 | 518,177
Fair value of shares earned | $ |  |  |  |  |  |  |  |  | $ 12,300 |
Released (in shares) |  |  |  |  |  |  |  |  | 639,522 | 369,355
RSUs | Forecast |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Incremental cost | $ |  |  |  |  |  |  | $ 100 |  |  |
Minimum | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 1 year |  |  |  |  |
Maximum | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 4 years |
2021 Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum number of common stock authorized for issuance (in shares) |  |  |  |  | 35,166,753 |  |  |  | 35,166,753 |
Maximum number of new common stock authorized for issuance (in shares) |  |  |  |  |  |  |  |  | 11,500,000 |
2021 Plan | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual life |  |  |  |  | 10 years |  |  |  | 10 years |
2021 Plan | Minimum | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 12 months |  |  |  | 12 months |
2021 Plan | Maximum | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |  | 4 years |
ESPP | Employee Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum number of common stock authorized for issuance (in shares) | 4,111,331 |  | 3,000,000 |  |  |  |  |  |  |
Common stock reserved, issuance, increase period | 10 years |  |  |  |  |  |  |  |  |
Percentage of outstanding stock maximum | 1.00% |  |  |  |  |  |  |  |  |
Maximum shares allowable under the plan (in shares) | 4,300,000 |  |  |  |  |  |  |  |  |
New shares available (in shares) | 1,111,331 |  |  |  |  |  |  |  |  |

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