Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Current:
Federal	$ (0.1)	$ 0.1	$ 2.3
State	0.9	0.1	0.7
Foreign	18.1	12.3	12.2
Total current	18.9	12.5	15.2
Deferred:
Federal	0.3	(0.1)	0.2
State	0.5	0.7	0.1
Foreign	(0.4)	(3.1)	(0.2)
Total deferred	0.4	(2.5)	0.1
Total provision	$ 19.3	$ 10.0	$ 15.3