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Acquisition - Summary of Net Assets Acquired (Detail) - USD ($)
$ in Thousands
Apr. 30, 2021
Apr. 30, 2020
Nov. 01, 2019
Apr. 30, 2019
Business Acquisition [Line Items]        
Goodwill $ 626,669 $ 613,943   $ 578,298
Acquired Companies        
Business Acquisition [Line Items]        
Current assets [1]     $ 44,475  
Long-term assets     15,024  
Intangibles assets     45,400  
Current liabilities     29,503  
Long-term liabilities     5,720  
Net assets acquired     69,676  
Purchase price     108,602  
Goodwill     $ 38,926  
[1] Included in current assets is acquired receivables in the amount of $41.1 million.