v3.25.1
Shareholders' equity - Accumulated other comprehensive income into income expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cost of goods sold $ 311,230 $ 321,715
Total before tax 108,943 (25,810)
Tax benefit (13,839) 41,551
Income from continuing operations 95,104 15,741
Settlements 0 138,139
Reclassification out of accumulated other comprehensive income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total reclassifications, net of tax 2,024 78,837
Reclassification out of accumulated other comprehensive income | Actuarial losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Actuarial (gains) losses 24 1,201
Reclassification out of accumulated other comprehensive income | Prior-service costs    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Prior-service costs 385 (492)
Reclassification out of accumulated other comprehensive income | Pension and Other Postretirement Benefits Plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before tax 409 138,848
Tax benefit (89) (58,232)
Income from continuing operations 320 80,616
Reclassification out of accumulated other comprehensive income | Foreign exchange contract | Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cost of goods sold 1,588 (1,762)
Total before tax 1,588 (1,762)
Tax benefit 116 (17)
Income from continuing operations $ 1,704 $ (1,779)