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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance $ 1,190,557  
Other comprehensive income (loss) before reclassifications (32,535) $ 23,956
Amounts reclassified from accumulated other comprehensive loss 369 1,141
Total Other Comprehensive (Loss) Income (32,166) 25,097
Balance 1,174,008  
Accumulated Other Comprehensive Loss [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (439,580) (507,287)
Balance (471,746) (482,190)
Foreign Currency Translation [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (251,573) (319,212)
Other comprehensive income (loss) before reclassifications (40,325) 27,405
Amounts reclassified from accumulated other comprehensive loss 0 0
Total Other Comprehensive (Loss) Income (40,325) 27,405
Balance (291,898) (291,807)
Unamortized Retirement Costs [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (191,026) (190,502)
Other comprehensive income (loss) before reclassifications 7,720 (3,017)
Amounts reclassified from accumulated other comprehensive loss 1,091 1,070
Total Other Comprehensive (Loss) Income 8,811 (1,947)
Balance (182,215) (192,449)
Interest Rate Swaps [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance 3,019 2,427
Other comprehensive income (loss) before reclassifications 70 (432)
Amounts reclassified from accumulated other comprehensive loss (722) 71
Total Other Comprehensive (Loss) Income (652) (361)
Balance $ 2,367 $ 2,066