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Operating Leases, Other Supplemental Information for Operating Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Other Supplemental Information for Operating Leases [Abstract]    
Weighted-average remaining contractual lease term (years) 9 years 10 years
Weighted-average discount rate 5.83% 5.89%
Cash paid for amounts included in the measurement of lease liabilities [Abstract]    
Operating cash flows from operating leases $ 7,974 $ 8,974