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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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