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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 1,181,347	$ 1,190,557	$ 1,003,137
Other comprehensive income (loss) before reclassifications	(71,549)	(68,835)	64,399
Amounts reclassified from Accumulated Other Comprehensive Loss	4,790	(323)	3,308
Total other comprehensive income (loss)	(66,759)	(69,158)	67,707
Balance	933,624	1,181,347	1,190,557
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(508,738)	(439,580)	(507,287)
Balance	(575,497)	(508,738)	(439,580)
Foreign Currency Translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(312,107)	(251,573)	(319,212)
Other comprehensive income (loss) before reclassifications	(28,596)	(60,534)	67,639
Amounts reclassified from Accumulated Other Comprehensive Loss	0	0	0
Total other comprehensive income (loss)	(28,596)	(60,534)	67,639
Balance	(340,703)	(312,107)	(251,573)
Unamortized Retirement Costs [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(196,057)	(191,026)	(190,502)
Other comprehensive income (loss) before reclassifications	(36,965)	(9,422)	(4,979)
Amounts reclassified from Accumulated Other Comprehensive Loss	5,102	4,391	4,455
Total other comprehensive income (loss)	(31,863)	(5,031)	(524)
Balance	(227,920)	(196,057)	(191,026)
Interest Rate Swaps [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(574)	3,019	2,427
Other comprehensive income (loss) before reclassifications	(5,988)	1,121	1,739
Amounts reclassified from Accumulated Other Comprehensive Loss	(312)	(4,714)	(1,147)
Total other comprehensive income (loss)	(6,300)	(3,593)	592
Balance	$ (6,874)	$ (574)	$ 3,019

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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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