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Acquisitions - Schedule of Unaudited Pro Forma Financial Information (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Acquisition Date [Line Items]
Total net revenues	$ 474.1	$ 952.2
Net income	$ 40.4	$ 80.5
Net income per share:
Basic	$ 0.74	$ 1.48
Diluted	$ 0.73	$ 1.46

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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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-Publisher FASB
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