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Retirement Plans - Components of Net Pension Expense (Income) and Weighted-Average Assumptions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
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 11,242 9,451 9,504
Expected return on plan assets (9,924) (12,144) (11,969)
Amortization of prior service cost (154) (154) (154)
Amortization of net actuarial loss 2,295 2,617 3,501
Curtailment/settlement (credit) 0 0 0
Net pension expense (income) $ 3,459 $ (230) $ 882
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 4.60% 3.20% 3.10%
Expected return on plan assets 5.00% 5.30% 5.80%
Cost due to settlement and curtailment $ 0 $ 0 $ 0
Non-US      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 796 1,196 1,396
Interest cost 13,389 11,148 8,901
Expected return on plan assets (23,134) (28,118) (26,971)
Amortization of prior service cost 60 67 58
Amortization of net actuarial loss 3,851 4,846 4,516
Curtailment/settlement (credit) (1,828) (39) 0
Net pension expense (income) $ (6,866) $ (10,900) $ (12,100)
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 3.00% 1.90% 1.60%
Rate of compensation increase 3.10% 3.00% 3.00%
Expected return on plan assets 5.50% 5.50% 5.70%
Cost due to settlement and curtailment $ 1,828 $ 39 $ 0
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