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Share-based compensation - Stock Option and SAR Rollforward (Details)
6 Months Ended
Jun. 28, 2025
$ / shares
shares
Number of options  
Beginning balance (in shares) | shares 7,859,326
Granted (in shares) | shares 29,100
Forfeited (in shares) | shares (2,834)
Exercised (in shares) | shares (3,852,782)
Ending balance (in shares) | shares 4,032,810
Weighted average exercise price $  
Beginning balance (in usd per share) | $ / shares $ 10.70
Granted (in usd per share) | $ / shares 21.64
Forfeited (in usd per share) | $ / shares 17.61
Exercised (in usd per share) | $ / shares 8.11
Ending balance (in usd per share) | $ / shares $ 13.26
—Share options  
Number of options  
Beginning balance (in shares) | shares 1,480,065
Exercised (in shares) | shares (119,790)
Ending balance (in shares) | shares 1,360,275
Weighted average exercise price $  
Beginning balance (in usd per share) | $ / shares $ 14.56
Exercised (in usd per share) | $ / shares 14.79
Ending balance (in usd per share) | $ / shares $ 14.54
Exercisable at the end of the period (in shares) | shares 3,967,619
Exercisable at the end of the period (in usd per share) | $ / shares $ 13.18
Vested and expected to vest at the end of the period (in shares) | shares 4,032,810
Vested and expected to vest at the end of the period (in usd per share) | $ / shares $ 13.25
—SARs  
Number of options  
Beginning balance (in shares) | shares 603,393
Granted (in shares) | shares 29,100
Forfeited (in shares) | shares (2,834)
Exercised (in shares) | shares (112,604)
Ending balance (in shares) | shares 517,055
Weighted average exercise price $  
Beginning balance (in usd per share) | $ / shares $ 10.79
Granted (in usd per share) | $ / shares 21.64
Forfeited (in usd per share) | $ / shares 17.61
Exercised (in usd per share) | $ / shares 10.96
Ending balance (in usd per share) | $ / shares $ 11.33
—Premium-priced options  
Number of options  
Beginning balance (in shares) | shares 835,469
Ending balance (in shares) | shares 835,469
Weighted average exercise price $  
Beginning balance (in usd per share) | $ / shares $ 18.88
Ending balance (in usd per share) | $ / shares $ 18.88
—Tier I | —Share options  
Number of options  
Beginning balance (in shares) | shares 1,557,018
Exercised (in shares) | shares (1,212,124)
Ending balance (in shares) | shares 344,894
Weighted average exercise price $  
Beginning balance (in usd per share) | $ / shares $ 6.95
Exercised (in usd per share) | $ / shares 6.71
Ending balance (in usd per share) | $ / shares $ 7.78
—Tier II | —Share options  
Number of options  
Beginning balance (in shares) | shares 1,722,639
Exercised (in shares) | shares (1,208,634)
Ending balance (in shares) | shares 514,005
Weighted average exercise price $  
Beginning balance (in usd per share) | $ / shares $ 7.00
Exercised (in usd per share) | $ / shares 6.68
Ending balance (in usd per share) | $ / shares $ 7.76
—Tier IV | —Share options  
Number of options  
Beginning balance (in shares) | shares 1,660,742
Exercised (in shares) | shares (1,199,630)
Ending balance (in shares) | shares 461,112
Weighted average exercise price $  
Beginning balance (in usd per share) | $ / shares $ 10.48
Exercised (in usd per share) | $ / shares 10.02
Ending balance (in usd per share) | $ / shares $ 11.68