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Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Feb. 01, 2019
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition share price |  |  |  |  | $ 30.00
Stock-based compensation expense | $ 7.4 | $ 7.4 | $ 22.7 | $ 42.1 |
Electro Scientific Industries Inc [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition share price |  |  |  |  | $ 30.00
Fair value write-up of acquired finished goods inventory | 7.6 |  | 7.6 |  |
Incremental costs of sales charge |  |  |  | 7.6 |
Fair value excluding write-up of acquired property, plant and equipment | $ 39.3 |  | $ 39.3 |  |
Compensation expense |  |  |  | 2.7 |
Stock-based compensation expense |  |  |  | $ 14.0 |

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