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Income Taxes (Components Of Income Tax Expense Attributable To Earnings) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Income Taxes [Abstract]
Federal current tax expense	$ 23,519	$ 9,937	$ (6,171)
State current tax expense	4,455	2,345	1,871
Current income tax expense, total	27,974	12,282	(4,300)
Deferred income taxes	36,530	54,442	60,914
Total income tax provision	$ 64,504	$ 66,724	$ 56,614

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- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations.

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