Disclosure of Compensation Related Costs, Share Based Payments - Schedule of Stock Option Activity (Details) - Prior Plans - Employee Stock Option	3 Months Ended
	Jul. 31, 2020 $ / shares shares
Number of option shares
Outstanding at the beginning of the period (in shares) | shares	43,189
Exercised (in shares) | shares	4,748
Outstanding at the end of the period (in shares) | shares	38,441
Weighted average option exercise price
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 44.39
Exercised (in dollars per share) | $ / shares	44.39
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 44.39