Segment Reporting - Revenues by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Schedule Of Revenues From External Customers [Line Items]
Total	$ 887.4	$ 885.1	$ 765.0	$ 698.4	$ 698.8	$ 755.6	$ 779.8	$ 709.8	$ 3,235.9	$ 2,944.0	$ 2,102.8
United States [Member]
Schedule Of Revenues From External Customers [Line Items]
Total									2,356.0	2,198.0	1,288.4
United Kingdom [Member]
Schedule Of Revenues From External Customers [Line Items]
Total									494.0	557.0	597.9
Canada [Member]
Schedule Of Revenues From External Customers [Line Items]
Total									202.8	131.4	151.5
All Other Countries [Member]
Schedule Of Revenues From External Customers [Line Items]
Total									$ 183.1	$ 57.6	$ 65.0