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Acquisitions - Summary of Purchase Price (Detail) - USD ($) $ in Millions |  | 6 Months Ended
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Feb. 01, 2019 | Jun. 30, 2019
Acquisition Date [Line Items] |  |
Total purchase price, net of cash and cash equivalents acquired |  | $ 988.6
Electro Scientific Industries Inc [Member] |  |
Acquisition Date [Line Items] |  |
Cash paid for outstanding shares | $ 1,032.7 |
Settlement of share-based compensation awards | 30.6 |
Total purchase price | 1,063.3 |
Less: Cash and cash equivalents acquired | (44.1) |
Total purchase price, net of cash and cash equivalents acquired | $ 1,019.2 |

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