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STOCK - BASED COMPENSATION - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 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. 24, 2023
USD ($)
shares
Sep. 25, 2022
USD ($)
Sep. 24, 2023
USD ($)
$ / shares
shares
Sep. 25, 2022
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total stock-based compensation | $         $ 11,466 $ 17,601 $ 40,133 $ 62,973
Weighted average grant date fair value of options (in dollars per share) | $ / shares             $ 8.97 $ 10.18
Performance based milestone targets | milestone     3          
Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total stock-based compensation | $         2,140 2,771 $ 6,716 $ 7,870
Unrecognized compensation expense | $         15,600   $ 15,600  
Expected period for recognition             2 years 29 days  
PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total stock-based compensation | $         6,894 9,048 $ 24,991 $ 27,145
Unrecognized compensation expense | $         35,600   $ 35,600  
Expected period for recognition             1 year 6 months 3 days  
Shares granted (in shares)       6,300,000     0 0
New shares issued (in shares)   321,428            
Performance based milestone targets | performance_based_milestone_target   3            
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        
PSUs | Spyce                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total stock-based compensation | $         700 800 $ 2,400 $ 2,500
Unrecognized compensation expense | $         9,800   9,800  
RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total stock-based compensation | $         2,432 $ 5,782 8,426 $ 27,958
Unrecognized compensation expense | $         $ 11,600   $ 11,600  
Expected period for recognition             1 year 8 months 15 days  
Shares granted (in shares)             398,043 566,245
Fair value of shares earned | $             $ 4,400  
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  
2009 Stock Plan And 2019 Equity Incentive Plan | Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Contractual life         10 years   10 years  
2009 Stock Plan And 2019 Equity Incentive Plan | Minimum | Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period         1 year   1 year  
2009 Stock Plan And 2019 Equity Incentive 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