Employee Benefit and Retirement Plans (Narrative) (Details)	12 Months Ended
	Apr. 30, 2023 USD ($) plan	Apr. 30, 2022 USD ($)	Apr. 30, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Recognized expenses for profit-sharing contributions	$ 4,700,000	$ 800,000	$ 2,900,000
401(k) contributions, percent match of employee's annual contribution			100.00%
Effective maximum contribution of base earnings			4.00%
Number of defined benefit pension plans | plan	2
Accumulated other comprehensive loss, net of tax	$ (10,372,000)	(10,225,000)
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of after tax earnings contributed in profit sharing	0.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of after tax earnings contributed in profit sharing	5.00%
401(k) Plan [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expense for 401(k) matching contributions	$ 12,400,000	$ 11,700,000	$ 11,900,000