Acquisitions - Additional Information (Detail) - USD ($) $ in Millions				3 Months Ended
	Jan. 30, 2017	Nov. 16, 2016	Oct. 31, 2016	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Cash purchase price of acquisition				$ 9.5
Goodwill				859.8		$ 895.5
Pre tax expenses				0.6
Cost of goods sold				0.2
Operating expenses				278.5	$ 259.9
Ryeson Corporation [Member]
Business Acquisition [Line Items]
Cash purchase price of acquisition		$ 12.6
Goodwill				5.0
Cash purchase price of acquisition		$ 13.0
Working capital adjustment				0.1
Ryeson Corporation [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Non-amortized trademark				3.7
Car-O-Liner Holding AB [Member]
Business Acquisition [Line Items]
Cash purchase price of acquisition			$ 148.1
Goodwill				69.0
Cash purchase price of acquisition			$ 152.0
Working capital adjustment				0.2
Operating expenses				0.4
BTC [Member]
Business Acquisition [Line Items]
Cash purchase price of acquisition	$ 9.2
Goodwill				$ 8.6