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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

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