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Leases - Schedule of Capital Leased Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Capital Leased Assets    
Gross capital leased assets $ 25,323 $ 13,690
Real Estate    
Capital Leased Assets    
Gross capital leased assets 12,516 10,997
Equipment    
Capital Leased Assets    
Gross capital leased assets 12,807 2,693
Real Estate And Equipment    
Capital Leased Assets    
Gross capital leased assets 25,323 13,690
Less accumulated amortization 9,536 7,315
Net capital leased assets $ 15,787 $ 6,375