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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 28, 2017 | May 04, 2017 | Jan. 30, 2017 | Nov. 16, 2016 | Oct. 31, 2016 | Jul. 27, 2015 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition, net of cash acquired |  |  |  |  |  |  | $ 82,900,000 | $ 160,400,000 | $ 11,800,000
Goodwill |  |  |  |  |  |  | 924,100,000 | 895,500,000 | 790,100,000
Operating expenses |  |  |  |  |  |  | 1,160,900,000 | $ 1,054,100,000 | $ 1,053,700,000
Torque Control Specialists Pty Ltd [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition | $ 3,600,000 |  |  |  |  |  |  |  |
Cash purchase price of acquisition, net of cash acquired | $ 3,500,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 1,900,000 |  |
Norbar [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition |  | $ 71,600,000 |  |  |  |  |  |  |
Cash purchase price of acquisition, net of cash acquired |  | $ 69,900,000 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 23,700,000 |  |
BTC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition, net of cash acquired |  |  | $ 9,200,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 5,900,000 |  |
Ryeson Corporation [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition |  |  |  | $ 13,000,000 |  |  |  |  |
Cash purchase price of acquisition, net of cash acquired |  |  |  | $ 12,600,000 |  |  |  |  |
Goodwill |  |  |  |  |  |  | 5,000,000 |  |
Car-O-Liner Holding AB [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition |  |  |  |  | $ 152,000,000 |  |  |  |
Cash purchase price of acquisition, net of cash acquired |  |  |  |  | $ 148,100,000 |  |  |  |
Goodwill |  |  |  |  |  |  | 77,300,000 |  |
Pretax benefit/expense |  |  |  |  |  |  | 500,000 |  |
Cost of goods sold |  |  |  |  |  |  | 200,000 |  |
Operating expenses |  |  |  |  |  |  | $ 300,000 |  |
Ecotechnics S.p.A [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash purchase price of acquisition, net of cash acquired |  |  |  |  |  | $ 11,800,000 |  |  |

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