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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - UNAUDITED - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - UNAUDITED [Abstract]
Net income	$ 13,830	$ 16,334
Other comprehensive (loss) income:
Foreign currency translation adjustment	(5,937)	46,853
Unamortized retirement credits (costs), net of tax (expense) benefit of $(443) and $1,705, respectively	1,589	(5,665)
Unrealized gain on interest rate swaps, net of tax (expense) of $(173) and $(30), respectively	538	191
Total other comprehensive (loss) income	(3,810)	41,379
Comprehensive income	$ 10,020	$ 57,713

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