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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Apr. 30, 2018
Equity based compensation arrangements      
Long-term liabilities related to plans $ 11,125   $ 15,707
Selling, general and administrative expenses      
Equity based compensation arrangements      
Expense related to equity based compensation arrangements 2,200 $ 3,200  
Stock Appreciation Rights      
Equity based compensation arrangements      
Award liability as of beginning of period 21,944    
Amounts redeemed (1,216)    
Change in fair value 1,426    
Award liability as of end of period 22,154    
Current liabilities related to plans 981   308
Long-term liabilities related to plans $ 21,173   21,636
Settlement period 4 years    
Deferred Compensation      
Equity based compensation arrangements      
Award liability as of beginning of period $ 2,222    
Amounts redeemed (715)    
Change in fair value 118    
Award liability as of end of period 1,625    
Current liabilities related to plans     133
Long-term liabilities related to plans $ 1,625   2,089
Settlement period 5 years    
Redeemable Noncontrolling Interests      
Equity based compensation arrangements      
Award liability as of beginning of period $ 16,170    
Amounts redeemed (4,673)    
Change in fair value 661    
Award liability as of end of period 12,158    
Current liabilities related to plans 1,034   463
Long-term liabilities related to plans $ 11,124   $ 15,707
Settlement period 5 years