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Fair Value Measurements (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Apr. 30, 2020
Feb. 28, 2019
Fair Value Measurements        
Impairment charges $ 0 $ 0    
Fair Value, Measurements, Recurring | Level 3        
Fair Value Measurements        
Stock appreciation rights 24,998   $ 24,205  
Deferred compensation 1,702   1,660  
Noncontrolling interest holders 8,510   8,300  
Interest rate swap agreements | Fair Value, Measurements, Recurring | Level 2        
Fair Value Measurements        
Derivative liabilities $ 30,948   $ 32,218  
Interest rate swap agreements | Term Loan Facility        
Fair Value Measurements        
Notional amount       $ 500,000
Interest rate swap agreements | LIBOR | Term Loan Facility        
Fair Value Measurements        
Fixed interest rate       2.46%