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Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Dec. 28, 2019
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 938,500,000 |  | $ 938,500,000 |  | $ 913,800,000
Accumulated impairment losses | 0 |  | $ 0 |  |
Weighted-average amortization period (in years) |  |  | 11 years |  |
Aggregate amortization expense | 5,800,000 | $ 5,500,000 | $ 17,200,000 | $ 16,300,000 |
Estimated annual amortization expense for fiscal period 2020 | 22,700,000 |  | 22,700,000 |  |
Estimated annual amortization expense for fiscal period 2021 | 21,300,000 |  | 21,300,000 |  |
Estimated annual amortization expense for fiscal period 2022 | 17,700,000 |  | 17,700,000 |  |
Estimated annual amortization expense for fiscal period 2023 | 14,500,000 |  | 14,500,000 |  |
Estimated annual amortization expense for fiscal period 2024 | 11,200,000 |  | 11,200,000 |  |
Estimated annual amortization expense for fiscal period 2025 | 6,800,000 |  | 6,800,000 |  |
Sigmavision |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | 5,600,000 |  | 5,600,000 |  |
Cognitran Limited |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | 14,500,000 |  | $ 14,500,000 |  |
Customer relationships |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-average amortization period (in years) |  |  | 15 years |  |
Customer relationship contractual term, minimum (in years) |  |  | 3 years |  |
Customer relationship contractual term, maximum (in years) |  |  | 5 years |  |
Repair Systems & Information Group |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | 628,500,000 |  | $ 628,500,000 |  | $ 615,100,000
Repair Systems & Information Group | Sigmavision |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 5,600,000 |  | 5,600,000 |  |
Repair Systems & Information Group | Cognitran Limited |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill, purchase accounting adjustments |  |  | $ 3,100,000 |  |

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