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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