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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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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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