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Acquisitions and Dispositions - Schedule of Unaudited Pro Forma Financial Information (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Acquisition Date [Line Items]
Total net revenues	$ 1,914,561	$ 2,445,711
Net income	$ 171,537	$ 424,778
Net income per share:
Basic	$ 3.14	$ 7.81
Diluted	$ 3.11	$ 7.72

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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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