v3.26.1
Employee benefits - Expenses recognized in profit or loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 25, 2025
Sep. 26, 2024
Sep. 26, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement [line items]            
Interest income       $ (9,842) $ (9,907) $ (8,746)
Cost of revenues       577,812 630,601 681,931
Research and development       161,128 160,329 171,392
Sales and marketing       23,392 23,530 23,856
Total compensation       132,866 136,525 146,494
Income tax benefit       9,592 (2,435) (5,028)
Cash award expenses            
Statement [line items]            
Cost of revenues         60 174
Research and development       1,211 6,193 15,273
General and administrative       102 546 1,401
Sales and marketing       346 1,086 2,797
Total compensation       1,659 7,885 19,645
Income tax benefit       $ 350 $ 1,770 $ 4,167
Total annual bonus cash payouts $ 269 $ 1,035 $ 729      
Vested on grant date $ 122 $ 164 $ 187