Revenue Recognition - Summary of Revenue by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 363.3	$ 254.3	$ 1,029.0	$ 779.8
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	155.6	136.1	453.3	406.4
Singapore [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	132.2	68.1	364.0	212.3
South Korea [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	21.1	15.6	62.7	51.7
Taiwan [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	18.3	11.5	48.5	31.1
Austria [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	14.7	9.7	42.2	34.2
China [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	12.6	7.7	33.7	28.1
Other [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 8.8	$ 5.6	$ 24.6	$ 16.0