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Acquisitions - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Apr. 01, 2020
Nov. 01, 2019
Feb. 01, 2019
Dec. 31, 2019
Lumerical        
Percentage of shares acquired 100.00%      
Payments to acquire businesses, gross $ 107,500      
Lumerical | Developed Software and Core Technologies        
Discount Rate 16.50%      
Finite-lived intangible asset, useful life 10 years      
Lumerical | Trade Names        
Discount Rate 16.50%      
Finite-lived intangible asset, useful life 6 years      
Royalty Rate 2.00%      
Lumerical | Customer Lists        
Discount Rate 12.50%      
Finite-lived intangible asset, useful life 10 years      
Attrition Rate 10.00%      
Livermore Software Technology Corporation        
Percentage of shares acquired   100.00%    
Payments to acquire businesses, gross   $ 472,800    
Business combination, consideration transferred   $ 781,500    
Business acquisition, equity interest issued or issuable, number of shares   1,400    
Business combination, consideration transferred, equity interests issued and issuable   $ 308,700    
Livermore Software Technology Corporation | Common Stock        
Business combination, consideration transferred, equity interests issued and issuable   307,200    
Livermore Software Technology Corporation | Treasury Stock        
Business combination, consideration transferred, equity interests issued and issuable   $ 1,500    
Granta Design        
Percentage of shares acquired     100.00%  
Payments to acquire businesses, gross     $ 208,700  
Other Acquisitions        
Payments to acquire businesses, gross       $ 138,600