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Acquisitions - Summary of Purchase Price (Detail) - USD ($) $ in Thousands		9 Months Ended
	Feb. 01, 2019	Sep. 30, 2019
Acquisition Date [Line Items]
Total purchase price, net of cash and cash equivalents acquired		$ 988,599
Electro Scientific Industries Inc [Member]
Acquisition Date [Line Items]
Cash paid for outstanding shares	$ 1,032,671
Settlement of share-based compensation awards	30,630
Total purchase price	1,063,301
Less: Cash and cash equivalents acquired	(44,072)
Total purchase price, net of cash and cash equivalents acquired	$ 1,019,229

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Acquisition Date [Line Items]

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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-Topic 805
-SubTopic 30
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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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