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Leases - Schedule of Capital Leased Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Capital Leased Assets    
Gross capital leased assets $ 13,690 $ 14,683
Real Estate    
Capital Leased Assets    
Gross capital leased assets 10,997 13,480
Equipment    
Capital Leased Assets    
Gross capital leased assets 2,693 2,693
Real Estate And Equipment    
Capital Leased Assets    
Gross capital leased assets 13,690 16,173
Less accumulated amortization 7,315 7,039
Net capital leased assets $ 6,375 $ 9,134