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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2016
Apr. 30, 2016
Equity based compensation arrangements    
Long-term liabilities related to plans $ 24,378 $ 25,247
Stock appreciation rights    
Equity based compensation arrangements    
Settlement period 4 years  
Fair value of award liability as of beginning of period $ 20,533  
Amounts redeemed (20)  
Change in fair value (92)  
Fair value of award liability as of end of period 20,421  
Stock appreciation rights | Accrued compensation and employee benefits    
Equity based compensation arrangements    
Current liabilities related to plans 806 808
Long-term liabilities related to plans $ 19,615 19,725
Deferred compensation    
Equity based compensation arrangements    
Settlement period 5 years  
Fair value of award liability as of beginning of period $ 3,270  
Change in fair value 46  
Fair value of award liability as of end of period 3,316  
Deferred compensation | Accrued compensation and employee benefits    
Equity based compensation arrangements    
Current liabilities related to plans 224 0
Deferred compensation | Other liabilities    
Equity based compensation arrangements    
Long-term liabilities related to plans $ 3,092 3,270
Noncontrolling interest awards    
Equity based compensation arrangements    
Settlement period 5 years  
Fair value of award liability as of beginning of period $ 26,585  
Change in fair value 246  
Fair value of award liability as of end of period 26,831  
Noncontrolling interests converted 32,545  
Noncontrolling interest awards | Accrued compensation and employee benefits    
Equity based compensation arrangements    
Current liabilities related to plans 2,453 1,338
Noncontrolling interest awards | Liabilities to noncontrolling interest holders, less current portion    
Equity based compensation arrangements    
Long-term liabilities related to plans $ 24,378 $ 25,247