Segment Reporting - Reconciliation of Segment Assets to Total Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 30, 2017
Segment Reporting Information [Line Items]
Total assets	$ 3,211.8	$ 4,093.1
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	$ 3,211.8	3,006.9
Assets of Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total assets		$ 1,086.2