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Goodwill and Intangible Assets - Acquired Intangible Assets (Parenthetical) (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ in Millions		12 Months Ended
	Feb. 01, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 316.2	$ 316.2
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		274.0
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 25.4	25.4
Trademarks Tradenames And Backlog
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 16.8

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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