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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED [Abstract]
Net income	$ 55,967	$ 68,432	$ 69,797	$ 84,766
Other comprehensive (loss) income:
Foreign currency translation adjustment	(9,483)	(11,626)	(15,420)	35,227
Unamortized retirement credits (costs), net of tax (expense) benefit of $(1,183), $(996), $(1,626), and $709, respectively	4,065	3,403	5,654	(2,262)
Unrealized gain on interest rate swaps, net of tax (expense) of $(602), $(222), $(775) and $(252), respectively	1,809	699	2,347	890
Total other comprehensive (loss) income	(3,609)	(7,524)	(7,419)	33,855
Comprehensive income	$ 52,358	$ 60,908	$ 62,378	$ 118,621

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