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Pension and other postretirement benefits - Net benefit cost of pension and postretirement benefit plans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jul. 02, 2023
Jun. 30, 2024
Jul. 02, 2023
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Settlements $ 0 $ 0 $ 138,139 $ 0
Pension        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 62 360 663 720
Interest cost 271 4,344 2,389 8,694
Expected return on plan assets (128) (6,315) (2,329) (12,625)
Net amortization and deferral 164 2,156 1,518 4,310
Settlements     138,139 0
Net benefit expense (income) 369 545 140,380 1,099
Other Benefits        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0 0 0 0
Interest cost 110 187 219 373
Expected return on plan assets 0 0 0 0
Net amortization and deferral (645) (339) (1,290) (678)
Settlements     0 0
Net benefit expense (income) $ (535) $ (152) $ (1,071) $ (305)