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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance $ 1,003,137 $ 1,037,106 $ 1,055,040
Other comprehensive (loss) income before reclassifications 64,399 (67,015)  
Amounts reclassified from Accumulated Other Comprehensive Loss 3,308 7,414  
Total Other Comprehensive Income (Loss) 67,707 (59,601) (41,053)
Balance 1,190,557 1,003,137 1,037,106
Accumulated Other Comprehensive Loss [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (507,287) (447,686) (406,633)
Balance (439,580) (507,287) (447,686)
Foreign Currency Translation [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (319,212) (267,920)  
Other comprehensive (loss) income before reclassifications 67,639 (51,292)  
Amounts reclassified from Accumulated Other Comprehensive Loss 0 0  
Total Other Comprehensive Income (Loss) 67,639 (51,292)  
Balance (251,573) (319,212) (267,920)
Unamortized Retirement Costs [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (190,502) (179,405)  
Other comprehensive (loss) income before reclassifications (4,979) (18,458)  
Amounts reclassified from Accumulated Other Comprehensive Loss 4,455 7,361  
Total Other Comprehensive Income (Loss) (524) (11,097)  
Balance (191,026) (190,502) (179,405)
Interest Rate Swaps [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance 2,427 (361)  
Other comprehensive (loss) income before reclassifications 1,739 2,735  
Amounts reclassified from Accumulated Other Comprehensive Loss (1,147) 53  
Total Other Comprehensive Income (Loss) 592 2,788  
Balance $ 3,019 $ 2,427 $ (361)