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Retirement Plans, Expected Employer Contributions and Benefit Payments and Other Retirement Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items]      
Expected employer contributions to the defined benefit pension plans $ 15,600    
Expected future benefit payments [Abstract]      
2019 23,924    
2020 25,246    
2021 24,857    
2022 26,659    
2023 27,566    
2024-2028 150,760    
Total 279,012    
U.S. [Member]      
Expected future benefit payments [Abstract]      
2019 15,435    
2020 15,589    
2021 14,322    
2022 14,550    
2023 14,947    
2024-2028 75,428    
Total 150,271    
Other postretirement benefits [Abstract]      
Curtailment gain (loss) 0 $ (8,842) $ (1,857)
Annual (credits) expenses for benefit plans 647 9,655 2,799
Non-U.S. [Member]      
Expected future benefit payments [Abstract]      
2019 8,489    
2020 9,657    
2021 10,535    
2022 12,109    
2023 12,619    
2024-2028 75,332    
Total 128,741    
Other postretirement benefits [Abstract]      
Curtailment gain (loss) (19) 0 0
Annual (credits) expenses for benefit plans (7,641) (3,150) (4,657)
Non-U.S. [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected employer contributions to the defined benefit pension plans 10,700    
Postretirement Life Insurance and Health Care Benefits [Member]      
Other postretirement benefits [Abstract]      
Curtailment gain (loss) 2,500    
Accumulated post-retirement benefit obligation 1,800 1,700  
Annual (credits) expenses for benefit plans (100) (200) 200
Defined Contribution Savings Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Expense recorded $ 14,400 $ 15,500 $ 16,200