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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance			$ 1,003,137
Other comprehensive income (loss) before reclassifications	$ 42,224	$ 7,464	70,381	$ (37,409)
Amounts reclassified from accumulated other comprehensive loss	1,324	768	3,728	6,678
Total Other Comprehensive Income (Loss)	43,548	8,232	74,109	(30,731)
Balance	1,168,326		1,168,326
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(476,726)	(486,649)	(507,287)	(447,686)
Balance	(433,178)	(478,417)	(433,178)	(478,417)
Foreign Currency Translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(286,171)	(338,384)	(319,212)	(267,920)
Other comprehensive income (loss) before reclassifications	51,401	7,783	84,442	(62,681)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total Other Comprehensive Income (Loss)	51,401	7,783	84,442	(62,681)
Balance	(234,770)	(330,601)	(234,770)	(330,601)
Unamortized Retirement Costs [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(193,028)	(148,250)	(190,502)	(179,405)
Other comprehensive income (loss) before reclassifications	(9,686)	(2,603)	(14,376)	22,891
Amounts reclassified from accumulated other comprehensive loss	1,099	838	3,263	6,499
Total Other Comprehensive Income (Loss)	(8,587)	(1,765)	(11,113)	29,390
Balance	(201,615)	(150,015)	(201,615)	(150,015)
Interest Rate Swaps [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	2,473	(15)	2,427	(361)
Other comprehensive income (loss) before reclassifications	509	2,284	315	2,381
Amounts reclassified from accumulated other comprehensive loss	225	(70)	465	179
Total Other Comprehensive Income (Loss)	734	2,214	780	2,560
Balance	$ 3,207	$ 2,199	$ 3,207	$ 2,199

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581

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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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