Income Taxes (Schedule of Reconciliation of Unrecognized Tax Benefits) (Details) (USD $) In Thousands	12 Months Ended
Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Income Taxes
Balance, beginning of the year	$ 129,767	$ 124,605	$ 137,608
Additions based on tax positions related to prior years	28,262	12,957	14,541
Reductions based on tax positions related to prior years	(1,473)	(2,427)	(6,096)
Additions based on tax positions related to the current year	3,417	3,314	4,110
Reductions related to settlements with tax authorities	(7,639)	(8,545)	(18,189)
Expiration of statute of limitations	(315)	(1,061)	(5,007)
Foreign currency translation	1,057	924	(2,362)
Other	1,772
Balance, end of the year	$ 154,848	$ 129,767	$ 124,605

Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation

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Unrecognized Tax Benefits Increases Resulting From Other

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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-Publisher FASB
-Name FASB Interpretation (FIN)
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-Paragraph 21
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6527854

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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