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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Equity based compensation arrangements      
Long-term liabilities related to plans $ 15,707 $ 22,576  
Selling, general and administrative expenses      
Equity based compensation arrangements      
Expense related to equity based compensation arrangements 4,000 3,700 $ 2,900
Stock Appreciation Rights      
Equity based compensation arrangements      
Award liability as of beginning of year 20,662 20,533  
Redemption notes   (28)  
Amounts redeemed (1,036)    
Change in fair value 2,318 157  
Award liability as of end of year 21,944 20,662 20,533
Current liabilities related to plans 308 878  
Long-term liabilities related to plans $ 21,636 19,784  
Settlement period 4 years    
Stock Appreciation Rights | Change in accounting for liability equity-based awards      
Equity based compensation arrangements      
Increase (decrease) to Accumulated deficit as a result of the change     11,200
Deferred Compensation      
Equity based compensation arrangements      
Award liability as of beginning of year $ 3,750 3,270  
Amounts redeemed (1,733)    
Change in fair value 205 480  
Award liability as of end of year 2,222 3,750 3,270
Current liabilities related to plans 133 300  
Long-term liabilities related to plans $ 2,089 3,450  
Settlement period 5 years    
Deferred Compensation | Change in accounting for liability equity-based awards      
Equity based compensation arrangements      
Increase (decrease) to Accumulated deficit as a result of the change     (200)
Redeemable Noncontrolling Interests      
Equity based compensation arrangements      
Award liability as of beginning of year $ 24,309 26,585  
Redemption notes   (5,354)  
Amounts redeemed (9,664)    
Change in fair value 1,525 3,078  
Award liability as of end of year 16,170 24,309 26,585
Current liabilities related to plans 463 1,733  
Long-term liabilities related to plans $ 15,707 $ 22,576  
Settlement period 5 years    
Redeemable Noncontrolling Interests | Change in accounting for liability equity-based awards      
Equity based compensation arrangements      
Increase (decrease) to Accumulated deficit as a result of the change     $ (3,700)