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Retirement Plans, Components of Net Pension Expense and Weighted-Average Assumptions (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 29, 2016
USD ($)
Participant
Oct. 31, 2016
USD ($)
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Weighted-average assumptions [Abstract]          
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     $ 8,842 $ 0 $ 0
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     800,100 797,400  
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets     753,300 759,200  
Fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets     579,700 567,800  
U.S. Plans [Member]          
Defined benefit plans, net periodic benefit cost [Abstract]          
Service Cost     0 0 0
Interest Cost     12,398 13,612 13,159
Expected Return on Plan Assets     (14,053) (14,756) (13,782)
Net Amortization of Prior Service Cost     (154) (154) (115)
Recognized Net Actuarial Loss     2,622 2,240 1,470
Curtailment/Settlement Loss (Gain)     8,842 1,857 0
Net Pension Expense (Income)     $ 9,655 $ 2,799 $ 732
Weighted-average assumptions [Abstract]          
Discount Rate     4.00% 4.20% 4.70%
Rate of Compensation Increase    
Expected Return on Plan Assets     6.80% 6.80% 6.80%
Non-U.S. Plans [Member]          
Defined benefit plans, net periodic benefit cost [Abstract]          
Service Cost     $ 967 $ 1,455 $ 5,942
Interest Cost     14,449 16,446 17,417
Expected Return on Plan Assets     (21,173) (25,088) (22,654)
Net Amortization of Prior Service Cost     54 55 68
Recognized Net Actuarial Loss     2,553 2,475 6,299
Curtailment/Settlement Loss (Gain)     0 0 (428)
Net Pension Expense (Income)     $ (3,150) $ (4,657) $ 6,644
Weighted-average assumptions [Abstract]          
Discount Rate     3.50% 3.50% 4.20%
Rate of Compensation Increase     3.00% 3.00% 3.20%
Expected Return on Plan Assets     6.70% 6.70% 6.70%