Retirement Plans - Components of Net Pension Expense (Income) and Weighted-Average Assumptions (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Retirement Indemnity Plan for the Employees of Cross Knowledge
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Curtailment credit	$ (300)	$ (100)
US
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0	0	$ 0
Interest cost	11,654	11,242	9,451
Expected return on plan assets	(10,372)	(9,924)	(12,144)
Amortization of prior service cost	(154)	(154)	(154)
Amortization of net actuarial loss	2,446	2,295	2,617
Curtailment/settlement (credit)	0	0	0
Net pension expense (income)	$ 3,574	$ 3,459	$ (230)
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	5.10%	4.60%	3.20%
Expected return on plan assets	5.80%	5.00%	5.30%
Cost due to settlement and curtailment	$ 0	$ 0	$ 0
Non-US
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	532	796	1,196
Interest cost	16,069	13,389	11,148
Expected return on plan assets	(19,443)	(23,134)	(28,118)
Amortization of prior service cost	60	60	67
Amortization of net actuarial loss	5,656	3,851	4,846
Curtailment/settlement (credit)	0	(1,828)	(39)
Net pension expense (income)	$ 2,874	$ (6,866)	$ (10,900)
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.80%	3.00%	1.90%
Rate of compensation increase	3.00%	3.10%	3.00%
Expected return on plan assets	6.40%	5.50%	5.50%
Cost due to settlement and curtailment	$ 0	$ 1,828	$ 39
Russia | Russia Pension Plan | Maximum
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Curtailment/settlement (credit)	1,500
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Cost due to settlement and curtailment	$ (1,500)