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Restructuring charges, separation costs and impairment charges - Charges recognized (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 28, 2025	Mar. 29, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,596,000		$ 285,000	$ 4,289,000	$ 8,689,000
Goodwill impairment charge	100,000,000			108,117,000	2,110,000
Separation costs	16,027,000			32,144,000
Restructuring charges, separation costs and other impairment charges	117,623,000			144,550,000	10,799,000
Titan SGS
Restructuring Cost and Reserve [Line Items]
Goodwill impairment charge	100,000,000	$ 0		100,000,000
Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,451,000		254,000	3,965,000	8,543,000
Goodwill impairment charge	0			0	0
Separation costs	0			0
Restructuring charges, separation costs and other impairment charges	1,451,000			3,965,000	8,543,000
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	145,000		31,000	324,000	146,000
Goodwill impairment charge	100,000,000			108,117,000	2,110,000
Separation costs	16,027,000			32,144,000
Restructuring charges, separation costs and other impairment charges	116,172,000			140,585,000	2,256,000
2024 Restructuring plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,000			227,000
2024 Restructuring plan \| Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0			161,000
2024 Restructuring plan \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,000			66,000
2024 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,575,000		1,093,000	3,833,000	9,665,000
2024 Footprint realignment plan \| Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,451,000		1,066,000	3,617,000	9,638,000
2024 Footprint realignment plan \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	124,000		27,000	216,000	27,000
2023 Restructuring plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(95,000)		(832,000)
2023 Restructuring plan \| Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(95,000)		(914,000)
2023 Restructuring plan \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0		82,000
2023 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	13,000		301,000	345,000	1,047,000
2023 Footprint realignment plan \| Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0		301,000	330,000	1,044,000
2023 Footprint realignment plan \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	13,000		0	15,000	3,000
Other restructuring programs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,000		(1,014,000)	(116,000)	(1,191,000)
Other restructuring programs \| Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0		(1,018,000)	(143,000)	(1,225,000)
Other restructuring programs \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,000		$ 4,000	$ 27,000	$ 34,000