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Disclosure of Compensation Related Costs, Share Based Payments (Tables)
 9 Months Ended
Jan. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Options Activity Information concerning the issuance of stock options under the Prior Plans is presented in the following table:
 
Number of
option shares
 
Weighted
average option
exercise price
Outstanding at April 30, 2019
109,827

 
$
44.39

Granted
—

 
—

Exercised
53,886

 
44.39

Forfeited
—

 
—

Outstanding at January 31, 2020
55,941

 
$
44.39
Schedule of Restricted Stock Units Award Activity
Information concerning the unvested restricted stock units under the 2009 Plan and the 2018 Plan is presented in the following table:
 
 
Unvested at April 30, 2019
388,800

Granted
188,800

Vested
(108,484
)
Forfeited
(18,105
)
Performance Award Adjustments
18,552

Unvested at January 31, 2020
469,563