Government Subsidies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 25, 2020	Sep. 25, 2020	Sep. 27, 2019
Government Grants And Subsidies [Abstract]
Government subsidies to employees			$ 3.2
Offset to cost of revenues	$ 1.1				$ 1.8
Other income	(1.1)	$ 3.1		$ (3.2)	0.6	$ 4.2
Offset to cost of goods sold and other operating expenses	$ 0.4				$ 1.1