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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 31, 2018
Apr. 30, 2017
Equity based compensation arrangements    
Long-term liabilities related to plans $ 15,381 $ 22,576
Selling, general and administrative expenses    
Equity based compensation arrangements    
Expense related to equity based compensation arrangements $ 3,200  
Stock Appreciation Rights    
Equity based compensation arrangements    
Settlement period 4 years  
Award liability as of beginning of year $ 20,662  
Amounts redeemed (501)  
Change in fair value 1,863  
Award liability as of end of year 22,024  
Stock Appreciation Rights | Accrued compensation and employee benefits    
Equity based compensation arrangements    
Current liabilities related to plans 300 900
Stock Appreciation Rights | Other liabilities    
Equity based compensation arrangements    
Long-term liabilities related to plans $ 21,700 19,800
Deferred Compensation    
Equity based compensation arrangements    
Settlement period 5 years  
Award liability as of beginning of year $ 3,750  
Amounts redeemed (1,733)  
Change in fair value 178  
Award liability as of end of year 2,195  
Deferred Compensation | Accrued compensation and employee benefits    
Equity based compensation arrangements    
Current liabilities related to plans 100 300
Deferred Compensation | Other liabilities    
Equity based compensation arrangements    
Long-term liabilities related to plans $ 2,100 3,500
Redeemable Noncontrolling Interests    
Equity based compensation arrangements    
Settlement period 5 years  
Award liability as of beginning of year $ 24,309  
Amounts redeemed (9,664)  
Change in fair value 1,192  
Award liability as of end of year 15,837  
Redeemable Noncontrolling Interests | Accrued compensation and employee benefits    
Equity based compensation arrangements    
Current liabilities related to plans 400 1,700
Redeemable Noncontrolling Interests | Liabilities to noncontrolling interest holders, less current portion    
Equity based compensation arrangements    
Long-term liabilities related to plans $ 15,400 $ 22,600