Share-Based Payments (Details 3) - $ / shares	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Restricted Shares And Deferred Stock Units [Member]
Weighted-average grant date fair values of the equity awards
Restricted Shares and Deferred Stock Units and Performance Units	155,354	146,290	66,514
Weighted-Average Grant Date Fair Value Per Share	$ 143.60	$ 131.96	$ 135.10
Performance Units [Member]
Weighted-average grant date fair values of the equity awards
Restricted Shares and Deferred Stock Units and Performance Units	117,312	130,939	171,907
Weighted-Average Grant Date Fair Value Per Share	$ 153.20	$ 133.01	$ 135.53