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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Tables)
 6 Months Ended
Oct. 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(320)——
Change in fair value1,875 123 780 
Balance as of October 31, 2021$28,350 $1,998 $10,153 
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 October 31, 2021$1,248 $— $— 
Classified as long-term as of October 31, 202127,102 1,998 10,153