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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 933,624	$ 1,181,347	$ 1,190,557
Other comprehensive income (loss) before reclassifications	75,850	(71,549)	(68,835)
Amounts reclassified from Accumulated other comprehensive loss	8,857	4,790	(323)
Total other comprehensive income (loss)	84,707	(66,759)	(69,158)
Balance	1,091,291	933,624	1,181,347
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(575,497)	(508,738)	(439,580)
Balance	(490,790)	(575,497)	(508,738)
Foreign Currency Translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(340,703)	(312,107)	(251,573)
Other comprehensive income (loss) before reclassifications	82,762	(28,596)	(60,534)
Amounts reclassified from Accumulated other comprehensive loss	0	0	0
Total other comprehensive income (loss)	82,762	(28,596)	(60,534)
Balance	(257,941)	(340,703)	(312,107)
Unamortized Retirement Costs [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(227,920)	(196,057)	(191,026)
Other comprehensive income (loss) before reclassifications	(6,273)	(36,965)	(9,422)
Amounts reclassified from Accumulated other comprehensive loss	6,047	5,102	4,391
Total other comprehensive income (loss)	(226)	(31,863)	(5,031)
Balance	(228,146)	(227,920)	(196,057)
Interest Rate Swaps [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(6,874)	(574)	3,019
Other comprehensive income (loss) before reclassifications	(639)	(5,988)	1,121
Amounts reclassified from Accumulated other comprehensive loss	2,810	(312)	(4,714)
Total other comprehensive income (loss)	2,171	(6,300)	(3,593)
Balance	$ (4,703)	$ (6,874)	$ (574)

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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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