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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Acquisition Date [Line Items]
Total net revenues	$ 474,110	$ 683,764	$ 952,179	$ 1,344,409
Net income	$ 47,464	$ 132,601	$ 89,871	$ 230,765
Net income per share:
Basic	$ 0.87	$ 2.42	$ 1.65	$ 4.23
Diluted	$ 0.86	$ 2.40	$ 1.64	$ 4.17

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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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