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Goodwill and Intangible Assets - Estimated Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Apr. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
2022 $ 53,094  
2023 44,251  
2024 36,024  
2025 29,738  
2026 24,807  
Thereafter 101,588  
Net Carrying Value $ 289,502 $ 300,517