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Revenue from Contracts with Customers - Schedule of Deferred Revenue and Customer Advances by Arrangement (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Change in Contract with Customer, Liability [Line Items] |  |
Beginning balance, January 1 | $ 24.8 | $ 17.5
Additions to deferred revenue and customer advances | 46.6 | 34.8
Amount of deferred revenue and customer advances recognized in income | (38.0) | (27.4)
Ending balance, March 31 | $ 33.4 | 29.5
Electro Scientific Industries Inc [Member] |  |
Change in Contract with Customer, Liability [Line Items] |  |
Deferred revenue and customer advances assumed |  | $ 4.6

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