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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Apr. 30, 2017
Equity based compensation arrangements      
Long-term liabilities related to plans $ 21,560   $ 22,576
Stock appreciation income or (expense) 590 $ (92)  
Redeemable noncontrolling interests $ 866 $ 292  
Stock appreciation rights      
Equity based compensation arrangements      
Settlement period 4 years    
Award liability as of beginning of year $ 20,662    
Change in fair value 590    
Award liability as of end of year 21,252    
Stock appreciation rights | Accrued compensation and employee benefits      
Equity based compensation arrangements      
Current liabilities related to plans 529   878
Stock appreciation rights | Other liabilities      
Equity based compensation arrangements      
Long-term liabilities related to plans $ 20,723   19,784
Deferred compensation      
Equity based compensation arrangements      
Settlement period 5 years    
Award liability as of beginning of year $ 3,750    
Change in fair value 116    
Award liability as of end of year 3,866    
Deferred compensation | Accrued compensation and employee benefits      
Equity based compensation arrangements      
Current liabilities related to plans 344   480
Deferred compensation | Other liabilities      
Equity based compensation arrangements      
Long-term liabilities related to plans $ 3,522   3,450
Noncontrolling interest awards      
Equity based compensation arrangements      
Settlement period 5 years    
Award liability as of beginning of year $ 24,309    
Amounts redeemed (1,000)    
Change in fair value 750    
Award liability as of end of year 24,059    
Noncontrolling interest awards | Accrued compensation and employee benefits      
Equity based compensation arrangements      
Current liabilities related to plans 2,498   1,733
Noncontrolling interest awards | Liabilities to noncontrolling interest holders, less current portion      
Equity based compensation arrangements      
Long-term liabilities related to plans $ 21,560   $ 22,576