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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2017
Jul. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance $ 1,003,137  
Other comprehensive income (loss) before reclassifications 23,956 $ (36,027)
Amounts reclassified from accumulated other comprehensive loss 1,141 (439)
Total Other Comprehensive Income (Loss) 25,097 (36,466)
Balance 1,009,218 1,016,408
Accumulated Other Comprehensive Loss [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (507,287) (447,686)
Balance (482,190) (484,152)
Foreign Currency Translation [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (319,212) (267,920)
Other comprehensive income (loss) before reclassifications 27,405 (44,640)
Amounts reclassified from accumulated other comprehensive loss 0 0
Total Other Comprehensive Income (Loss) 27,405 (44,640)
Balance (291,807) (312,560)
Unamortized Retirement Costs [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (190,502) (179,405)
Other comprehensive income (loss) before reclassifications (3,017) 9,668
Amounts reclassified from accumulated other comprehensive loss 1,070 (664)
Total Other Comprehensive Income (Loss) (1,947) 9,004
Balance (192,449) (170,401)
Interest Rate Swaps [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance 2,427 (361)
Other comprehensive income (loss) before reclassifications (432) (1,055)
Amounts reclassified from accumulated other comprehensive loss 71 225
Total Other Comprehensive Income (Loss) (361) (830)
Balance $ 2,066 $ (1,191)