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Acquisitions - (Additional Information) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 07, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Business Acquisition [Line Items]            
Closing day spot rate (USD per share) $ 79.20          
Amortization of intangible assets   $ 7,309 $ 2,046 $ 14,625 $ 4,115  
Amortization of intangible assets, remainder of 2020   14,866   14,866    
Amortization of intangible assets, 2021   29,237   29,237    
Amortization of intangible assets, 2022   28,993   28,993    
Amortization of intangible assets, 2023   27,694   27,694    
Amortization of intangible assets, 2024   24,287   24,287    
Alpha            
Business Acquisition [Line Items]            
Initial purchase consideration $ 750,000          
Consideration transferred 742,502          
Estimated tax-deductible goodwill   $ 42,262   42,262    
Payments to acquire businesses 650,000          
Shares issued in acquisition, value 93,268          
Working capital adjustment $ 766          
Shares issued in acquisition (USD per share) $ 84.92          
Unrecognized Tax Benefits, Increase Resulting from Acquisition           $ 7,840
Alpha | Customer relationships            
Business Acquisition [Line Items]            
Acquired intangible assets       221,000    
Trademarks | Alpha            
Business Acquisition [Line Items]            
Acquired indefinite-lived intangible assets       $ 56,000    
Common Stock | Alpha            
Business Acquisition [Line Items]            
Shares issued in acquisition (in shares) 1,177,630