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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
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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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