Acquisition - Schedule of Unaudited Pro Forma Financial Information (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Acquisition Date [Line Items]
Total net revenues	$ 1,914.6	$ 2,445.7
Net income	$ 171.5	$ 424.8
Net income per share:
Basic	$ 3.14	$ 7.81
Diluted	$ 3.11	$ 7.72