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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 1,077,905	$ 973,745	$ 1,091,291	$ 933,624
Other comprehensive (loss) income before reclassifications	(5,866)	(9,978)	(11,954)	29,016
Amounts reclassified from accumulated other comprehensive loss	2,257	2,454	4,535	4,839
Total other comprehensive (loss) income	(3,609)	(7,524)	(7,419)	33,855
Balance	1,106,665	1,020,213	1,106,665	1,020,213
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(494,600)	(534,118)	(490,790)	(575,497)
Balance	(498,209)	(541,642)	(498,209)	(541,642)
Foreign Currency Translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(263,878)	(293,850)	(257,941)	(340,703)
Other comprehensive (loss) income before reclassifications	(9,483)	(11,626)	(15,420)	35,227
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive (loss) income	(9,483)	(11,626)	(15,420)	35,227
Balance	(273,361)	(305,476)	(273,361)	(305,476)
Unamortized Retirement Costs [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(226,557)	(233,585)	(228,146)	(227,920)
Other comprehensive (loss) income before reclassifications	2,639	1,900	2,781	(5,290)
Amounts reclassified from accumulated other comprehensive loss	1,426	1,503	2,873	3,028
Total other comprehensive (loss) income	4,065	3,403	5,654	(2,262)
Balance	(222,492)	(230,182)	(222,492)	(230,182)
Interest Rate Swaps [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(4,165)	(6,683)	(4,703)	(6,874)
Other comprehensive (loss) income before reclassifications	978	(252)	685	(921)
Amounts reclassified from accumulated other comprehensive loss	831	951	1,662	1,811
Total other comprehensive (loss) income	1,809	699	2,347	890
Balance	$ (2,356)	$ (5,984)	$ (2,356)	$ (5,984)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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