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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
6 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Apr. 30, 2018
Equity based compensation arrangements      
Long-term liabilities related to plans $ 11,566   $ 15,707
Selling, general and administrative expenses      
Equity based compensation arrangements      
Expense related to equity based compensation arrangements 1,800 $ 2,300  
Stock Appreciation Rights      
Equity based compensation arrangements      
Award liability as of beginning of year 21,944    
Amounts redeemed (534)    
Change in fair value 984    
Award liability as of end of year 22,394    
Current liabilities related to plans 1,017   308
Long-term liabilities related to plans $ 21,377   21,636
Settlement period 4 years    
Deferred Compensation      
Equity based compensation arrangements      
Award liability as of beginning of year $ 2,222    
Amounts redeemed (711)    
Change in fair value 112    
Award liability as of end of year 1,623    
Current liabilities related to plans 7   133
Long-term liabilities related to plans $ 1,616   2,089
Settlement period 5 years    
Redeemable Noncontrolling Interests      
Equity based compensation arrangements      
Award liability as of beginning of year $ 16,170    
Amounts redeemed (4,110)    
Change in fair value 702    
Award liability as of end of year 12,762    
Current liabilities related to plans 1,196   463
Long-term liabilities related to plans $ 11,566   $ 15,707
Settlement period 5 years