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Retirement Plans, Components of Net Pension Expense (Income) and Weighted-Average Assumptions (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 29, 2016
USD ($)
Participant
Oct. 31, 2016
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
Apr. 30, 2017
USD ($)
Weighted-average assumptions [Abstract]          
Net actuarial loss related to early lump sum payment of pension plan benefit     $ 0 $ 0 $ 8,842
Retirement plans with accumulated benefit obligations in excess of plan assets [Abstract]          
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets     794,200 820,400  
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets     762,800 787,600  
Fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets     621,900 624,400  
U.S. [Member]          
Defined benefit plans, net pension expense (income) [Abstract]          
Service Cost     0 0 0
Interest Cost     11,704 11,666 12,398
Expected Return on Plan Assets     (13,472) (13,154) (14,053)
Net Amortization of Prior Service Cost     (154) (154) (154)
Recognized Net Actuarial Loss     2,035 2,289 2,622
Curtailment/Settlement Loss     0 0 8,842
Net Pension Expense (Income)     $ 113 $ 647 $ 9,655
Weighted-average assumptions [Abstract]          
Discount Rate     4.30% 4.10% 4.00%
Rate of Compensation Increase    
Expected Return on Plan Assets     6.80% 6.80% 6.80%
Number of eligible participants | Participant 780        
Total liability for early payment of pension plan benefit in a single lump sum payment $ 28,300        
Lump sum payment for early payment of pension plan benefit   $ 28,300      
Net actuarial loss related to early lump sum payment of pension plan benefit         $ 8,800
Retirement plans with accumulated benefit obligations in excess of plan assets [Abstract]          
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets     $ 285,197 $ 279,644  
Non-U.S. [Member]          
Defined benefit plans, net pension expense (income) [Abstract]          
Service Cost     912 960 967
Interest Cost     12,943 13,876 14,449
Expected Return on Plan Assets     (25,551) (26,385) (21,173)
Net Amortization of Prior Service Cost     57 57 54
Recognized Net Actuarial Loss     3,746 3,832 2,553
Curtailment/Settlement Loss     0 19 0
Net Pension Expense (Income)     $ (7,893) $ (7,641) $ (3,150)
Weighted-average assumptions [Abstract]          
Discount Rate     2.60% 2.60% 3.50%
Rate of Compensation Increase     3.00% 3.00% 3.00%
Expected Return on Plan Assets     6.50% 6.50% 6.70%
Retirement plans with accumulated benefit obligations in excess of plan assets [Abstract]          
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets     $ 477,561 $ 507,932