Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Estimated Annual Amortization Expense Related to Amortizing Intangible Assets (Detail)

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Goodwill and Intangible Assets - Estimated Annual Amortization Expense Related to Amortizing Intangible Assets (Detail) - USD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2020 $ 13,204  
2021 13,071  
2022 13,060  
2023 11,208  
2024 8,731  
Thereafter 23,748  
Amortized intangible assets, Net $ 83,022 $ 96,504