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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance			$ 1,190,557
Other comprehensive income (loss) before reclassifications	$ (16,608)	$ 4,201	(49,143)	$ 28,157
Amounts reclassified from accumulated other comprehensive loss	(210)	1,263	159	2,404
Total Other Comprehensive (Loss) Income	(16,818)	5,464	(48,984)	30,561
Balance	1,169,392		1,169,392
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(471,746)	(482,190)	(439,580)	(507,287)
Balance	(488,564)	(476,726)	(488,564)	(476,726)
Foreign Currency Translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(291,898)	(291,807)	(251,573)	(319,212)
Other comprehensive income (loss) before reclassifications	(20,424)	5,636	(60,749)	33,041
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total Other Comprehensive (Loss) Income	(20,424)	5,636	(60,749)	33,041
Balance	(312,322)	(286,171)	(312,322)	(286,171)
Unamortized Retirement Costs [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(182,215)	(192,449)	(191,026)	(190,502)
Other comprehensive income (loss) before reclassifications	3,273	(1,673)	10,993	(4,690)
Amounts reclassified from accumulated other comprehensive loss	1,114	1,094	2,205	2,164
Total Other Comprehensive (Loss) Income	4,387	(579)	13,198	(2,526)
Balance	(177,828)	(193,028)	(177,828)	(193,028)
Interest Rate Swaps [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	2,367	2,066	3,019	2,427
Other comprehensive income (loss) before reclassifications	543	238	613	(194)
Amounts reclassified from accumulated other comprehensive loss	(1,324)	169	(2,046)	240
Total Other Comprehensive (Loss) Income	(781)	407	(1,433)	46
Balance	$ 1,586	$ 2,473	$ 1,586	$ 2,473

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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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