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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED [Abstract]
Net Income	$ 35,443	$ 34,942	$ 83,757	$ 105,021
Other Comprehensive Income (Loss):
Foreign currency translation adjustment	7,895	17,515	10,675	(43,234)
Unamortized retirement costs, net of tax benefit (provision) of $41, $596, $(317), and $(3,121), respectively	(816)	(2,081)	776	11,117
Unrealized loss on interest rate swaps, net of tax benefit of $132, $365, $412 and $814, respectively	(393)	(1,136)	(1,053)	(2,569)
Total Other Comprehensive Income (Loss)	6,686	14,298	10,398	(34,686)
Comprehensive Income	$ 42,129	$ 49,240	$ 94,155	$ 70,335

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