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Compensation Related Costs and Share Based Payments (Tables)
 9 Months Ended
Jan. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Options Activity Information concerning the issuance of stock options under the 2009 Plan is presented in the following table:
Number of
option shares		Weighted
average option
exercise price
Outstanding at April 30, 202043,189 $44.39 
Exercised37,491 44.39 
Outstanding at January 31, 20215,698 $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, 2020473,799 
Granted207,928 
Vested(154,842)
Forfeited(10,306)
Performance Award Adjustments56,071 
Unvested at January 31, 2021572,650