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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Apr. 30, 2018
Equity based compensation arrangements      
Long-term liabilities related to plans $ 12,773   $ 15,707
Selling, general and administrative expenses      
Equity based compensation arrangements      
Expense related to equity based compensation arrangements 900 $ 1,500  
Stock Appreciation Rights      
Equity based compensation arrangements      
Award liability as of beginning of year 21,944    
Change in fair value 334    
Award liability as of end of year 22,278    
Current liabilities related to plans 800   308
Long-term liabilities related to plans $ 21,478   21,636
Settlement period 4 years    
Deferred Compensation      
Equity based compensation arrangements      
Award liability as of beginning of year $ 2,222    
Amounts redeemed (689)    
Change in fair value 66    
Award liability as of end of year 1,599    
Current liabilities related to plans 4   133
Long-term liabilities related to plans $ 1,595   2,089
Settlement period 5 years    
Redeemable Noncontrolling Interests      
Equity based compensation arrangements      
Award liability as of beginning of year $ 16,170    
Amounts redeemed (2,444)    
Change in fair value 465    
Award liability as of end of year 14,191    
Current liabilities related to plans 1,418   463
Long-term liabilities related to plans $ 12,773   $ 15,707
Settlement period 5 years