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Operating Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 31, 2021
Apr. 30, 2021
Apr. 30, 2020
ROU Assets and Lease Liabilities [Abstract]      
Operating lease ROU assets   $ 121,430 $ 142,716
Short-term portion of operating lease liabilities   22,440 21,810
Operating lease liabilities, non-current   145,832 $ 159,782
Increase (decrease) in ROU assets due to new leases as well as modifications and remeasurements to existing operating leases   6,100  
Increase (decrease) in operating lease liabilities due to new leases as well as modifications and remeasurements to existing operating leases   $ 5,700  
Restructuring charges $ 18,300