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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 924.1 | $ 895.5 | $ 790.1
Gross carrying value, Total | $ 415.9 | 367.9 |
Weighted-average amortization period (in years) | 11 years |  |
Aggregate amortization expense | $ 27.6 | 24.2 | 24.7
Estimated annual amortization expense for fiscal period 2018 | 25.4 |  |
Estimated annual amortization expense for fiscal period 2019 | 21.8 |  |
Estimated annual amortization expense for fiscal period 2020 | 16.8 |  |
Estimated annual amortization expense for fiscal period 2021 | 14.4 |  |
Estimated annual amortization expense for fiscal period 2022 | 13.4 |  |
Repair Systems & Information Group [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | 613.2 | 640.6 | 524.5
Increase (decrease) in goodwill associated with acquisition | (49.1) |  |
Commercial & Industrial Group [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | 298.4 | 242.4 | $ 253.1
Increase (decrease) in goodwill associated with acquisition | (1.7) |  |
Norbar [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | 23.7 |  |
BTC [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | 5.9 |  |
Torque Control Specialists Pty Ltd [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | 1.9 |  |
Car-O-Liner Holding AB [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | 77.3 |  |
Increase (decrease) in goodwill associated with acquisition | (50.8) |  |
Car-O-Liner Holding AB [Member] | Trademarks [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Gross carrying value, Total | 29.8 |  |
Car-O-Liner Holding AB [Member] | Repair Systems & Information Group [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | 76.5 |  |
Car-O-Liner Holding AB [Member] | Commercial & Industrial Group [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | 0.8 |  |
Ryeson Corporation [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | 5.0 |  |
Increase (decrease) in goodwill associated with acquisition | (1.8) |  |
Customer relationships [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Gross carrying value, Total | $ 175.2 | $ 142.6 |
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 |  |
Customer relationships [Member] | Norbar [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Gross carrying value, Total | $ 1.1 |  |
Customer relationships [Member] | BTC [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Gross carrying value, Total | 1.2 |  |
Customer relationships [Member] | Car-O-Liner Holding AB [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Gross carrying value, Total | 28.8 |  |
BTC [Member] | Trademarks [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Gross carrying value, Total | 2.1 |  |
Norbar [Member] | Trademarks [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Gross carrying value, Total | $ 16.9 |  |

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