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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED [Abstract]
Net Income	$ 44,690	$ 43,784	$ 48,314	$ 70,079
Other Comprehensive Income (Loss):
Foreign currency translation adjustment	38,319	(20,424)	2,780	(60,749)
Unamortized retirement costs, net of tax benefit (provision) of $1,822, $(1,229), $(358), and $(3,717), respectively	(6,576)	4,387	1,592	13,198
Unrealized (loss) gain on interest rate swaps, net of tax benefit of $236, $245, $280 and $449, respectively	(745)	(781)	(660)	(1,433)
Total Other Comprehensive Income (Loss)	30,998	(16,818)	3,712	(48,984)
Comprehensive Income	$ 75,688	$ 26,966	$ 52,026	$ 21,095

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