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Restructuring charges, separation costs and impairment charges - Charges recognized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 29, 2025	Jun. 30, 2026	Jun. 29, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 246	$ 1,253	$ 17,091	$ 2,675
Goodwill impairment charge		8,117		8,117
Separation costs		1,330		1,330
Restructuring charges		10,700		12,122
Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	223	1,188	17,010	2,543
Goodwill impairment charge		0		0
Separation costs		0		0
Restructuring charges		1,188		2,543
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	23	65	81	132
Goodwill impairment charge		8,117		8,117
Separation costs		1,330		1,330
Restructuring charges		9,512		9,579
Strategic Divestitures restructuring plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	219		17,288
Strategic Divestitures restructuring plan \| Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	219		17,288
Strategic Divestitures restructuring plan \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0		0
VI Business integration plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3		(250)
VI Business integration plan \| Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4		(252)
VI Business integration plan \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(1)		2
2024 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,120		2,223
2024 Footprint realignment plan \| Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,066		2,131
2024 Footprint realignment plan \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		54		92
2023 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		87		332
2023 Footprint realignment plan \| Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges		87		330
2023 Footprint realignment plan \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0		2
Other restructuring programs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	24	46	53	120
Other restructuring programs \| Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	35	(26)	82
Other restructuring programs \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 24	$ 11	$ 79	$ 38