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Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 03, 2021 | Jun. 27, 2020 | Jul. 03, 2021 | Jun. 27, 2020 | Jan. 02, 2021
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 1,177,600,000 |  | $ 1,177,600,000 |  | $ 982,400,000
Accumulated impairment losses | 0 |  | $ 0 |  |
Weighted-average amortization period (in years) |  |  | 11 years |  |
Aggregate amortization expense | 6,300,000 | $ 5,700,000 | $ 12,300,000 | $ 11,400,000 |
Estimated annual amortization expense for fiscal period 2021 | 24,700,000 |  | 24,700,000 |  |
Estimated annual amortization expense for fiscal period 2022 | 22,200,000 |  | 22,200,000 |  |
Estimated annual amortization expense for fiscal period 2023 | 18,600,000 |  | 18,600,000 |  |
Estimated annual amortization expense for fiscal period 2024 | 13,200,000 |  | 13,200,000 |  |
Estimated annual amortization expense for fiscal period 2025 | 8,700,000 |  | 8,700,000 |  |
Estimated annual amortization expense for fiscal period 2026 | 8,000,000.0 |  | 8,000,000.0 |  |
Dealer-FX |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | 195,200,000 |  | 195,200,000 |  |
Secateurs Pradines |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | 9,600,000 |  | $ 9,600,000 |  |
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 | 830,900,000 |  | $ 830,900,000 |  | 638,800,000
Repair Systems & Information Group | Dealer-FX |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | 195,200,000 |  | 195,200,000 |  |
Commercial & Industrial Group |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | 334,300,000 |  | 334,300,000 |  | $ 331,200,000
Commercial & Industrial Group | Secateurs Pradines |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 9,600,000 |  | $ 9,600,000 |  |

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