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

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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