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Leases - Other information (Details) - USD ($)
$ in Thousands
Apr. 30, 2020
Apr. 30, 2019
Finance leases included in property and equipment    
Property and equipment $ 464,021 $ 405,932
Accumulated depreciation (158,554) (123,583)
Property and equipment, net $ 305,467 282,349
Weighted-average remaining lease term (years) - Operating leases 4 years 10 months 24 days  
Weighted-average remaining lease term (years) - Finance leases 3 years 7 months 6 days  
Weighted-average discount rate - Operating leases 5.50%  
Weighted-average discount rate - Finance leases 5.00%  
Finance Leased Assets    
Finance leases included in property and equipment    
Property and equipment $ 171,380 134,931
Accumulated depreciation (41,737) (27,686)
Property and equipment, net $ 129,643 $ 107,245