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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 1,142,269	$ 1,091,291	$ 933,624
Other comprehensive income (loss) before reclassifications	(21,448)	(26,213)	75,850
Amounts reclassified from Accumulated other comprehensive loss	692	8,857	8,857
Total other comprehensive (loss) income	(20,756)	(17,356)	84,707
Balance	1,045,027	1,142,269	1,091,291
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(508,146)	(490,790)	(575,497)
Balance	(528,902)	(508,146)	(490,790)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(329,566)	(257,941)	(340,703)
Other comprehensive income (loss) before reclassifications	3,220	(71,625)	82,762
Amounts reclassified from Accumulated other comprehensive loss	0	0	0
Total other comprehensive (loss) income	3,220	(71,625)	82,762
Balance	(326,346)	(329,566)	(257,941)
Unamortized Retirement Costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(182,226)	(228,146)	(227,920)
Other comprehensive income (loss) before reclassifications	(29,053)	40,247	(6,273)
Amounts reclassified from Accumulated other comprehensive loss	4,473	5,673	6,047
Total other comprehensive (loss) income	(24,580)	45,920	(226)
Balance	(206,806)	(182,226)	(228,146)
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	3,646	(4,703)	(6,874)
Other comprehensive income (loss) before reclassifications	4,385	5,165	(639)
Amounts reclassified from Accumulated other comprehensive loss	(3,781)	3,184	2,810
Total other comprehensive (loss) income	604	8,349	2,171
Balance	$ 4,250	$ 3,646	$ (4,703)

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