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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED [Abstract]
Net income	$ 68,432	$ 44,690	$ 84,766	$ 48,314
Other Comprehensive (Loss) Income:
Foreign currency translation adjustment	(11,626)	38,319	35,227	2,780
Unamortized retirement credits (costs), net of tax (expense) benefit of $(996), $1,822, $709, and $(358), respectively	3,403	(6,576)	(2,262)	1,592
Unrealized gain (loss) on interest rate swaps, net of tax (expense) benefit of $(222), $236, $(252) and $280, respectively	699	(745)	890	(660)
Total Other Comprehensive (Loss) Income	(7,524)	30,998	33,855	3,712
Comprehensive Income	$ 60,908	$ 75,688	$ 118,621	$ 52,026

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