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Share-based Compensation - Schedule of Stock Option Activity (Details) - KKI - $ / shares
3 Months Ended 9 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
Options        
Beginning balance, share options outstanding (in shares)     2,662,000  
Granted (in shares)     2,060,000  
Exercised (in shares)     0  
Forfeited or expired (in shares)     789,000  
Ending balance, share options outstanding (in shares) 3,933,000   3,933,000  
Forfeited or expired (in USD per share)     $ 5.36  
Exercised (in USD per share)     0  
Granted (in USD per share)     1.58  
Weighted Average Grant Date Fair Value        
Beginning balance, share options outstanding (in USD per share)     5.88  
Ending balance, share options outstanding (in USD per share) $ 3.73   3.73  
Forfeited or expired (in USD per share)     13.45  
Exercised (in USD per share)     0  
Granted (in USD per share)     3.22  
Weighted Average Exercise Price        
Beginning balance, share options outstanding (in USD per share)     14.27  
Ending balance, share options outstanding (in USD per share) $ 8.64   $ 8.64  
Stock options vested (in shares) 0 0 0 1,500,000