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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance $ 1,037,106 $ 1,055,040 $ 1,182,248
Other comprehensive (loss) income before reclassifications (67,015) (46,565)  
Amounts reclassified from Accumulated Other Comprehensive loss 7,414 5,512  
Total Other Comprehensive (Loss) Income (59,601) (41,053) (216,342)
Balance 1,003,137 1,037,106 1,055,040
Accumulated Other Comprehensive Loss [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (447,686) (406,633) (190,291)
Balance (507,287) (447,686) (406,633)
Foreign Currency Translation [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (267,920) (246,854)  
Other comprehensive (loss) income before reclassifications (51,292) (21,066)  
Amounts reclassified from Accumulated Other Comprehensive loss 0 0  
Total Other Comprehensive (Loss) Income (51,292) (21,066)  
Balance (319,212) (267,920) (246,854)
Unamortized Retirement Costs [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (179,405) (159,434)  
Other comprehensive (loss) income before reclassifications (18,458) (24,930)  
Amounts reclassified from Accumulated Other Comprehensive loss 7,361 4,959  
Total Other Comprehensive (Loss) Income (11,097) (19,971)  
Balance (190,502) (179,405) (159,434)
Interest Rate Swaps [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (361) (345)  
Other comprehensive (loss) income before reclassifications 2,735 (569)  
Amounts reclassified from Accumulated Other Comprehensive loss 53 553  
Total Other Comprehensive (Loss) Income 2,788 (16)  
Balance $ 2,427 $ (361) $ (345)