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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015 | Oct. 31, 2016
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 895.5 | $ 790.1 | $ 810.7 |
Weighted-average amortization period (in years) | 11 years |  |  |
Aggregate amortization expense | $ 24.2 | 24.7 | 24.7 |
Estimated annual amortization expense for fiscal period 2017 | 23.2 |  |  |
Estimated annual amortization expense for fiscal period 2018 | 20.8 |  |  |
Estimated annual amortization expense for fiscal period 2019 | 17.5 |  |  |
Estimated annual amortization expense for fiscal period 2020 | 13.9 |  |  |
Estimated annual amortization expense for fiscal period 2021 | 12.2 |  |  |
Repair Systems & Information Group [Member] |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | 640.6 | 524.5 | 522.3 |
Commercial & Industrial Group [Member] |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | 242.4 | $ 253.1 | $ 275.9 |
Car O Liner Holding AB And Ryeson Corporation [Member] |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | 131.3 |  |  |
Car-O-Liner Holding AB [Member] |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | 128.1 |  |  | $ 128.1
Car-O-Liner Holding AB [Member] | Repair Systems & Information Group [Member] |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | 125.6 |  |  |
Car-O-Liner Holding AB [Member] | Commercial & Industrial Group [Member] |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | 2.5 |  |  |
Ryeson Corporation [Member] |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | 3.2 |  |  |
Ryeson Corporation [Member] | Commercial & Industrial Group [Member] |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 3.2 |  |  |
Customer relationships [Member] |  |  |  |
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 |  |  |
Trademarks [Member] |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Weighted-average amortization period (in years) | 6 years |  |  |
Trademarks [Member] | Ryeson Corporation [Member] |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Non-amortized trademark | $ 3.7 |  |  |

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