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Acquisitions - Schedule of Unaudited Pro Forma Financial Information (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Acquisition Date [Line Items]
Total net revenues	$ 462,451	$ 573,070	$ 1,414,660	$ 1,917,348
Net income	$ 47,669	$ 91,111	$ 127,676	$ 357,333
Net income per share:
Basic	$ 0.87	$ 1.67	$ 2.34	$ 6.55
Diluted	$ 0.86	$ 1.65	$ 2.32	$ 6.48

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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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