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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,082,326	$ 1,077,905	$ 1,142,269	$ 1,091,291
Other comprehensive (loss) income before reclassifications	(23,255)	(5,866)	(39,793)	(11,954)
Amounts reclassified from accumulated other comprehensive loss	558	2,257	1,953	4,535
Total other comprehensive loss	(22,697)	(3,609)	(37,840)	(7,419)
Ending balance	1,077,807	1,106,665	1,077,807	1,106,665
Accumulated other comprehensive loss, net of tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(523,289)	(494,600)	(508,146)	(490,790)
Ending balance	(545,986)	(498,209)	(545,986)	(498,209)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(349,346)	(263,878)	(329,566)	(257,941)
Other comprehensive (loss) income before reclassifications	(36,148)	(9,483)	(55,928)	(15,420)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive loss	(36,148)	(9,483)	(55,928)	(15,420)
Ending balance	(385,494)	(273,361)	(385,494)	(273,361)
Unamortized Retirement Costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(177,145)	(226,557)	(182,226)	(228,146)
Other comprehensive (loss) income before reclassifications	7,089	2,639	11,068	2,781
Amounts reclassified from accumulated other comprehensive loss	1,057	1,426	2,159	2,873
Total other comprehensive loss	8,146	4,065	13,227	5,654
Ending balance	(168,999)	(222,492)	(168,999)	(222,492)
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	3,202	(4,165)	3,646	(4,703)
Other comprehensive (loss) income before reclassifications	5,804	978	5,067	685
Amounts reclassified from accumulated other comprehensive loss	(499)	831	(206)	1,662
Total other comprehensive loss	5,305	1,809	4,861	2,347
Ending balance	$ 8,507	$ (2,356)	$ 8,507	$ (2,356)

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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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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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