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Operating Leases, Other Supplemental Information for Operating Leases (Details) - USD ($)
$ in Thousands
6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Other Supplemental Information for Operating Leases [Abstract]    
Weighted-average remaining contractual lease term 9 years 10 years
Weighted-average discount rate 5.91% 5.91%
Cash paid for amounts included in the measurement of lease liabilities [Abstract]    
Operating cash flows from operating leases $ 16,866 $ 14,716