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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, 2017
Apr. 30, 2016
Apr. 30, 2015
Defined Benefit Plan Disclosure [Line Items]      
Expected employer contributions to the defined benefit pension plans $ 12,300    
Expected future benefit payments [Abstract]      
2018 23,700    
2019 23,100    
2020 24,600    
2021 24,100    
2022 25,800    
2023 through 2027 143,500    
Defined Contribution Plan Disclosure [Line Items]      
Restructuring charges 13,355 $ 28,611 $ 28,804
Defined Contribution Savings Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Employer cash contributions 15,200 16,300 14,800
Restructuring charges     800
Expense recorded 15,500 16,200 15,200
U.S. Plans [Member]      
Other postretirement benefits [Abstract]      
Curtailment gain (8,842) (1,857) 0
Annual expenses for benefit plans 9,655 2,799 732
Non-U.S. Plans [Member]      
Other postretirement benefits [Abstract]      
Curtailment gain 0 0 428
Annual expenses for benefit plans (3,150) (4,657) 6,644
Non-U.S. Plans [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected employer contributions to the defined benefit pension plans 7,300    
Postretirement Life Insurance and Health Care Benefits [Member]      
Other postretirement benefits [Abstract]      
Curtailment gain 2,500    
Accumulated post-retirement benefit obligation 1,700 2,200  
Annual expenses for benefit plans $ (200) $ 200 $ 700