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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Equity based compensation arrangements      
Long-term liabilities related to plans $ 10,929 $ 15,707  
Selling, general and administrative expenses      
Equity based compensation arrangements      
Expense related to equity based compensation arrangements 3,900 4,000 $ 3,700
Stock Appreciation Rights      
Equity based compensation arrangements      
Award liability as of beginning of period 21,944 20,662  
Redemption notes   (1,036)  
Amounts redeemed (1,216)    
Change in fair value 2,730 2,318  
Award liability as of end of period 23,458 21,944 20,662
Current liabilities related to plans 1,355 308  
Long-term liabilities related to plans $ 22,103 21,636  
Settlement period 4 years    
Deferred Compensation      
Equity based compensation arrangements      
Award liability as of beginning of period $ 2,222 3,750  
Redemption notes   (1,733)  
Amounts redeemed (715)    
Change in fair value 188 205  
Award liability as of end of period 1,695 2,222 3,750
Current liabilities related to plans 108 133  
Long-term liabilities related to plans $ 1,587 2,089  
Settlement period 5 years    
Redeemable Noncontrolling Interests      
Equity based compensation arrangements      
Award liability as of beginning of period $ 16,170 24,309  
Redemption notes   (9,664)  
Amounts redeemed (4,673)    
Change in fair value 1,001 1,525  
Award liability as of end of period 12,498 16,170 $ 24,309
Current liabilities related to plans 1,569 463  
Long-term liabilities related to plans $ 10,929 $ 15,707  
Settlement period 5 years