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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Tables)
 3 Months Ended
Jul. 31, 2021
Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests  
Summary of changes to the liabilities for stock appreciation rights, deferred compensation and redeemable noncontrolling interests
The following table presents a summary of changes to the liabilities for stock appreciation rights, deferred compensation and redeemable noncontrolling interests:
Stock
Appreciation
Rights		Deferred
Compensation		Redeemable
Noncontrolling
Interests
(in thousands)
Balance as of April 30, 2021$26,795 $1,875 $9,373 
Amounts redeemed— ——
Change in fair value892 51 259 
Balance as of July 31, 2021$27,687 $1,926 $9,632 
Classified as current as of April 30, 2021$1,305 $— $— 
Classified as long-term as of April 30, 202125,490 1,875 9,373 
Classified as current as of July 31, 2021$1,521 $— $— 
Classified as long-term as of July 31, 202126,166 1,926 9,632