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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Tables)
 12 Months Ended
Apr. 30, 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, 2019$23,458 $1,695 $12,498 
Amounts redeemed(825)(108)(4,644)
Change in fair value1,572 73 446 
Balance as of April 30, 202024,205 1,660 8,300 
Amounts redeemed(583)— — 
Change in fair value3,173 215 1,073 
Balance as of April 30, 2021$26,795 $1,875 $9,373 
Classified as current as of April 30, 2020$624 $— $— 
Classified as long-term as of April 30, 202023,581 1,660 8,300 
Classified as current as of April 30, 2021$1,305 $— $— 
Classified as long-term as of April 30, 202125,490 1,875 9,373