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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 1,106,665	$ 1,020,213	$ 1,091,291	$ 933,624
Other comprehensive (loss) income before reclassifications	(11,469)	39,687	(23,423)	68,703
Amounts reclassified from accumulated other comprehensive loss	2,239	2,426	6,774	7,265
Total other comprehensive (loss) income	(9,230)	42,113	(16,649)	75,968
Balance	1,119,518	1,063,802	1,119,518	1,063,802
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(498,209)	(541,642)	(490,790)	(575,497)
Balance	(507,439)	(499,529)	(507,439)	(499,529)
Foreign Currency Translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(273,361)	(305,476)	(257,941)	(340,703)
Other comprehensive (loss) income before reclassifications	(15,918)	48,305	(31,338)	83,532
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive (loss) income	(15,918)	48,305	(31,338)	83,532
Balance	(289,279)	(257,171)	(289,279)	(257,171)
Unamortized Retirement Costs [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(222,492)	(230,182)	(228,146)	(227,920)
Other comprehensive (loss) income before reclassifications	3,275	(8,237)	6,056	(13,527)
Amounts reclassified from accumulated other comprehensive loss	1,413	1,463	4,286	4,491
Total other comprehensive (loss) income	4,688	(6,774)	10,342	(9,036)
Balance	(217,804)	(236,956)	(217,804)	(236,956)
Interest Rate Swaps [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(2,356)	(5,984)	(4,703)	(6,874)
Other comprehensive (loss) income before reclassifications	1,174	(381)	1,859	(1,302)
Amounts reclassified from accumulated other comprehensive loss	826	963	2,488	2,774
Total other comprehensive (loss) income	2,000	582	4,347	1,472
Balance	$ (356)	$ (5,402)	$ (356)	$ (5,402)

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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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