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Operating Leases (Details) - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2020
Apr. 30, 2020
ROU Assets and Lease Liabilities [Abstract]    
Operating lease right-of-use assets $ 137,095 $ 142,716
Short-term portion of operating lease liabilities 20,071 21,810
Operating lease liabilities, non-current 153,355 $ 159,782
Increase (decrease) in ROU assets due to new leases as well as modifications and remeasurements to existing operating leases 2,200  
Increase (decrease) in operating lease liabilities due to new leases as well as modifications and remeasurements to existing operating leases $ 2,200