Acquisitions - Schedule of Unaudited Pro Forma Financial Information (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Acquisition Date [Line Items]
Total net revenues	$ 462.5	$ 1,414.7
Net income	$ 47.7	$ 127.7
Net income per share:
Basic	$ 0.87	$ 2.34
Diluted	$ 0.86	$ 2.32