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Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012	Apr. 30, 2011
Comprehensive Income [Abstract]
Foreign currency translation adjustments	$ 22,813	$ 35,639
Defined benefit pension adjustments, net of taxes	(15,658)	(10,014)
Unrealized gains on marketable securities, net of taxes	36	35
Accumulated other comprehensive income, net	$ 7,191	$ 25,660

X

- Definition

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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