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STOCK - BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 28, 2026
Jun. 29, 2025
Dec. 28, 2025
Dec. 29, 2024
Number of Shares        
Beginning Balance (in shares) 14,070,559 13,169,869 13,169,869  
Options granted (in shares) 1,417,862 1,524,847    
Options exercised (in shares) (11,599) (323,369)    
Options forfeited (in shares) (490,510) (552,630)    
Options expired (in shares) (348,290) (26,467)    
Ending Balance (in shares) 14,638,022 13,792,250 14,070,559 13,169,869
Options exercisable, Number of shares (in shares) 11,215,186 10,425,334    
Options vested and expected to vest, Number of shares (in shares) 14,638,022 13,792,250    
Weighted Average Exercise Price Per Share        
Beginning Balance (in dollars per share) $ 10.35 $ 9.88 $ 9.88  
Options granted (in dollars per share) 5.76 22.09    
Options exercised (in dollars per share) 5.01 8.43    
Options forfeited (in dollars per share) 20.82 17.48    
Options expired (in dollars per share) 13.22 17.47    
Ending Balance (in dollars per share) 9.49 10.95 $ 10.35 $ 9.88
Options exercisable, Weighted average exercise price per share (in dollars per share) 8.94 8.23    
Options vested and expected to vest, Weighted average exercise price per share (in dollars per share) $ 9.49 $ 10.95    
Stock Options Additional Disclosures        
Options outstanding, Weighted average remaining contractual term 4 years 11 months 23 days 5 years 9 months 25 days 5 years 3 months 18 days 6 years 14 days
Options exercisable, Weighted average remaining contractual term 3 years 9 months 3 days 4 years 9 months 21 days    
Options vested and expected to vest, Weighted average remaining contractual term 4 years 11 months 23 days 5 years 9 months 25 days    
Options outstanding, Aggregate intrinsic value $ 29,803 $ 64,407 $ 12,769 $ 297,037
Options exercisable, Aggregate intrinsic value 24,180 60,880    
Options vested and expected to vest, Aggregate intrinsic value $ 29,803 $ 64,407