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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Selling, general and administrative expenses      
Equity based compensation arrangements [Roll Forward]      
Expense related to equity based compensation arrangements $ 6,400 $ 4,500 $ 2,100
Stock Appreciation Rights      
Equity based compensation arrangements [Roll Forward]      
Award liability as of beginning of period 26,795 24,205  
Amounts redeemed (320) (583)  
Change in fair value 4,403 3,173  
Award liability as of end of period 30,878 26,795 24,205
Current liabilities related to plans 1,532 1,305  
Long-term liabilities related to plans $ 29,346 25,490  
Settlement period 5 years    
Deferred Compensation      
Equity based compensation arrangements [Roll Forward]      
Award liability as of beginning of period $ 1,875 1,660  
Amounts redeemed 0 0  
Change in fair value 330 215  
Award liability as of end of period 2,205 1,875 1,660
Current liabilities related to plans 0 0  
Long-term liabilities related to plans $ 2,205 1,875  
Settlement period 5 years    
Redeemable Noncontrolling Interests      
Equity based compensation arrangements [Roll Forward]      
Award liability as of beginning of period $ 9,373 8,300  
Amounts redeemed 0 0  
Change in fair value 1,653 1,073  
Award liability as of end of period 11,026 9,373 $ 8,300
Current liabilities related to plans 0 0  
Long-term liabilities related to plans $ 11,026 $ 9,373  
Settlement period 5 years