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Operating Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2020
Apr. 30, 2020
ROU Assets and Lease Liabilities [Abstract]    
Operating lease right-of-use assets $ 139,798 $ 142,716
Short-term portion of operating lease liabilities 20,647 21,810
Operating lease liabilities, non-current 156,644 $ 159,782
Increase (decrease) in right of use assets 300  
Increase (decrease) in operating lease liabilities $ 300