Benefit Plans (Details) - Other Postretirement Benefits Plan - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Employer discretionary contribution	$ 11,765	$ 10,983	$ 10,382
Common stock held by trustee of the 401K plan (shares)	751,339	807,396