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Employee benefits - Expenses recognized in profit or loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 26, 2024
Sep. 26, 2023
Sep. 28, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement [line items]            
Interest income       $ (9,907) $ (8,746) $ (4,813)
Cost of revenues       630,601 681,931 714,233
Research and development       160,329 171,392 175,557
Sales and marketing       23,530 23,856 25,459
Total compensation       136,525 146,494 162,943
Income tax benefit       (2,435) (5,028) 41,098
Cash award expenses            
Statement [line items]            
Cost of revenues       60 174 505
Research and development       6,193 15,273 20,792
General and administrative       546 1,401 2,250
Sales and marketing       1,086 2,797 4,147
Total compensation       7,885 19,645 27,694
Income tax benefit       $ 1,770 $ 4,167 $ 5,641
Total annual bonus cash payouts $ 1,035 $ 729 $ 19,346      
Vested on grant date $ 164 $ 187 $ 1,015