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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net Income (Loss)	$ 60,048	$ (11,451)	$ 69,284	$ 19,549
Other Comprehensive Income (Loss):
Foreign currency translation adjustment	5,636	(25,824)	33,041	(70,464)
Unamortized retirement costs, net of tax (benefit) provision of $(131), $8,163, $(708) and $11,456, respectively	(579)	22,151	(2,526)	31,155
Unrealized gain on interest rate swaps, net of tax provision of $249, $721, $28 and $212, respectively	407	1,176	46	346
Total Other Comprehensive Income (Loss)	5,464	(2,497)	30,561	(38,963)
Comprehensive Income (Loss)	$ 65,512	$ (13,948)	$ 99,845	$ (19,414)

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