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Acquisitions - Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail) - Electro Scientific Industries Inc [Member] - USD ($)
$ in Thousands
 6 Months Ended
Feb. 01, 2019
Jun. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price $ 316,200 $ 316,200
Completed Technology [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price   274,000
Completed Technology [Member] | Lasers Products [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price 255,700  
Completed Technology [Member] | Non Laser Products [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price 18,300  
Trademarks and Trade Names [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price 14,400  
Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price 25,400 $ 25,400
Backlog [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price $ 2,400