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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, 2022
Apr. 30, 2021
Apr. 30, 2020
Retirement Indemnity Plan for the Employees of Cross Knowledge [Member] | Maximum [Member]      
Weighted-average assumptions [Abstract]      
Curtailment credit $ 100    
US [Member]      
Components of net pension income for defined benefit plans [Abstract]      
Service cost 0 $ 0 $ 0
Interest cost 9,451 9,504 11,247
Expected return on plan assets (12,144) (11,969) (14,038)
Amortization of prior service cost (154) (154) (154)
Amortization of net actuarial loss 2,617 3,501 2,403
Curtailment (credit)/settlement loss 0 0 0
Net pension (income) expense $ (230) $ 882 $ (542)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
Weighted-average assumptions [Abstract]      
Discount rate 3.20% 3.10% 4.10%
Expected return on plan assets 5.30% 5.80% 6.80%
Non-US [Member]      
Components of net pension income for defined benefit plans [Abstract]      
Service cost $ 1,196 $ 1,396 $ 1,851
Interest cost 11,148 8,901 12,652
Expected return on plan assets (28,118) (26,971) (26,116)
Amortization of prior service cost 67 58 73
Amortization of net actuarial loss 4,846 4,516 3,993
Curtailment (credit)/settlement loss (39) 0 291
Net pension (income) expense $ (10,900) $ (12,100) $ (7,256)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
Weighted-average assumptions [Abstract]      
Discount rate 1.90% 1.60% 2.40%
Rate of compensation increase 3.00% 3.00% 3.00%
Expected return on plan assets 5.50% 5.70% 6.50%
Canada [Member]      
Weighted-average assumptions [Abstract]      
Retirement plans settlement charges for employees     $ 300