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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED [Abstract]
Net Income	$ 68,842	$ 47,419	$ 138,126	$ 66,968
Other Comprehensive Income (Loss):
Foreign currency translation adjustment	51,401	7,783	84,442	(62,681)
Unamortized retirement costs, net of tax (benefit) provision of $(2,377), $(444), $(3,085) and $11,012, respectively	(8,587)	(1,765)	(11,113)	29,390
Unrealized gain on interest rate swaps, net of tax provision of $450, $1,357, $478 and $1,569, respectively	734	2,214	780	2,560
Total Other Comprehensive Income (Loss)	43,548	8,232	74,109	(30,731)
Comprehensive Income	$ 112,390	$ 55,651	$ 212,235	$ 36,237

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