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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED [Abstract]
Net Income	$ 43,784	$ 60,048	$ 70,079	$ 69,284
Other Comprehensive (Loss) Income:
Foreign currency translation adjustment	(20,424)	5,636	(60,749)	33,041
Unamortized retirement costs, tax provision (benefit) of $1,229, $(131), $3,717, and $(708), respectively	4,387	(579)	13,198	(2,526)
Unrealized gain on interest rate swaps, tax provision of $245, $249, $449 and $28, respectively	(781)	407	(1,433)	46
Total Other Comprehensive (Loss) Income	(16,818)	5,464	(48,984)	30,561
Comprehensive Income	$ 26,966	$ 65,512	$ 21,095	$ 99,845

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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