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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 1,045,027	$ 1,142,269	$ 1,091,291
Other comprehensive (loss) income before reclassifications	3,880	(21,448)	(26,213)
Amounts reclassified from Accumulated other comprehensive loss	(3,417)	692	8,857
Total other comprehensive income (loss)	463	(20,756)	(17,356)
Balance	739,716	1,045,027	1,142,269
Accumulated other comprehensive loss, net of tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(528,902)	(508,146)	(490,790)
Balance	(528,439)	(528,902)	(508,146)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(326,346)	(329,566)	(257,941)
Other comprehensive (loss) income before reclassifications	(7,481)	3,220	(71,625)
Amounts reclassified from Accumulated other comprehensive loss	0	0	0
Total other comprehensive income (loss)	(7,481)	3,220	(71,625)
Balance	(333,827)	(326,346)	(329,566)
Unamortized Retirement Costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(206,806)	(182,226)	(228,146)
Other comprehensive (loss) income before reclassifications	(37)	(29,053)	40,247
Amounts reclassified from Accumulated other comprehensive loss	5,921	4,473	5,673
Total other comprehensive income (loss)	5,884	(24,580)	45,920
Balance	(200,922)	(206,806)	(182,226)
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	4,250	3,646	(4,703)
Other comprehensive (loss) income before reclassifications	11,398	4,385	5,165
Amounts reclassified from Accumulated other comprehensive loss	(9,338)	(3,781)	3,184
Total other comprehensive income (loss)	2,060	604	8,349
Balance	$ 6,310	$ 4,250	$ 3,646

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

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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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