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Acquisitions - Narrative (Detail) - USD ($) $ in Millions |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2018 | Jul. 28, 2017 | May 04, 2017 | Jan. 30, 2017 | Nov. 16, 2016 | Oct. 31, 2016 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 902.2 | $ 924.1 | $ 895.5
Cash purchase price of acquisition, net of cash acquired |  |  |  |  |  |  | 3.0 | 82.9 | $ 160.4
George A. Sturdevant, Inc. (d/b/a Fastorq) |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition | $ 3.0 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 2.6 |  |
Torque Control Specialists Pty Ltd |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition |  | $ 3.6 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 2.0 | 1.9 |
Cash purchase price of acquisition, net of cash acquired |  | $ 3.5 |  |  |  |  |  |  |
Norbar |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition |  |  | $ 71.6 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 25.1 | 23.7 |
Cash purchase price of acquisition, net of cash acquired |  |  | $ 69.9 |  |  |  |  |  |
BTC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition |  |  |  | $ 9.2 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 5.9 |
Ryeson Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition |  |  |  |  | $ 13.0 |  |  |  |
Goodwill |  |  |  |  |  |  |  | 5.0 |
Cash purchase price of acquisition, net of cash acquired |  |  |  |  | $ 12.6 |  |  |  |
Car-O-Liner Holding AB |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition |  |  |  |  |  | $ 152.0 |  |  |
Goodwill |  |  |  |  |  |  |  | $ 77.3 |
Cash purchase price of acquisition, net of cash acquired |  |  |  |  |  | $ 148.1 |  |  |

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