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Leases - Other information (Details) - USD ($)
$ in Thousands
Jan. 31, 2020
Apr. 30, 2019
Finance leases included in property and equipment    
Accumulated depreciation $ (149,924) $ (123,583)
Property and equipment, net $ 306,472 $ 282,349
Weighted-average remaining lease term (years) - Operating leases 4 years 10 months 24 days  
Weighted-average remaining lease term (years) - Finance leases 3 years 4 months 24 days  
Weighted-average discount rate - Operating leases 5.50%  
Weighted-average discount rate - Finance leases 5.40%  
Finance Leased Assets    
Finance leases included in property and equipment    
Property and equipment $ 160,634  
Accumulated depreciation (37,746)  
Property and equipment, net $ 122,888