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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net Income	$ 113,643	$ 145,782	$ 176,868
Other Comprehensive Loss:
Foreign currency translation adjustment	(51,292)	(21,066)	(180,190)
Unrealized retirement costs, net of tax benefit of $3,286, $8,807 and $15,779, respectively	(11,097)	(19,971)	(36,409)
Unrealized gain (loss) on interest rate swaps, net of tax (provision) benefit of $(1,709), $10 and $(157), respectively	2,788	(16)	257
Total Other Comprehensive (Loss) Income	(59,601)	(41,053)	(216,342)
Comprehensive Income (Loss)	$ 54,042	$ 104,729	$ (39,474)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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