Employee Benefit and Retirement Plans (Net Periodic Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Retirement Benefits [Abstract]
Interest cost	$ 3,147	$ 4,662	$ 5,974
Expected return on plan assets	(3,601)	(8,430)	(8,327)
Recognized net actuarial loss	0	1,761	1,692
Defined Benefit Plan, Amortization of Gain (Loss)	(1,164)	0	0
Pension settlement, net	(68,473)	0	0
Pension benefit cost	$ 69,183	$ (2,007)	$ (661)