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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 01, 2019 | Dec. 31, 2019 | Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated Amortization |  | $ 308.0 | $ 350.6
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated Amortization |  | 84.2 | 99.6
Patents, Trademarks, Trade Names and Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated Amortization |  | 45.5 | $ 47.8
Electro Scientific Industries Inc [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price | $ 316.2 | 316.2 |
Finite lived intangible asset , gross favorable lease |  | 6.4 |
Electro Scientific Industries Inc [Member] | Completed Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price |  | 274.0 |
Electro Scientific Industries Inc [Member] | Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price | $ 25.4 | 25.4 |
Electro Scientific Industries Inc [Member] | Trademarks Tradenames and Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price |  | 16.8 |
Electro Scientific Industries Inc [Member] | Patents, Trademarks, Trade Names and Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated Amortization |  | $ 3.4 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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