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Business Acquisitions (Detail) - USD ($)
$ in Thousands
9 Months Ended 24 Months Ended
May 01, 2019
Mar. 04, 2019
Jan. 28, 2019
Oct. 16, 2018
Sep. 10, 2018
Sep. 30, 2019
Apr. 30, 2021
Dec. 31, 2018
Business Acquisition [Line Items]                
Goodwill           $ 1,354,795   $ 904,571
Acyclica [Member]                
Business Acquisition [Line Items]                
Business Combination, Consideration Transferred         $ 9,700      
Intangible assets acquired         3,900      
Goodwill         $ 7,000      
SeaPilot [Member]                
Business Acquisition [Line Items]                
Business Combination, Consideration Transferred       $ 4,600        
Intangible assets acquired       2,400        
Goodwill       $ 3,000        
Aeryon [Member]                
Business Acquisition [Line Items]                
Business Combination, Consideration Transferred     $ 205,900     205,922    
Identifiable Intangible assets           44,292    
Intangible assets acquired     44,300          
Goodwill     $ 154,700     154,716    
Endeavor [Member]                
Business Acquisition [Line Items]                
Business Combination, Consideration Transferred   $ 385,900       385,931    
Identifiable Intangible assets           102,740    
Intangible assets acquired   102,700            
Goodwill   $ 284,300       $ 284,327    
NEOS [Member]                
Business Acquisition [Line Items]                
Business Combination, Consideration Transferred $ 22,200              
Identifiable Intangible assets 6,400              
Goodwill $ 14,000              
Subsequent Event | NEOS [Member]                
Business Acquisition [Line Items]                
Business Combination, Consideration Transferred             $ 12,000