Income Taxes (Schedule Of Income Tax Expense)(Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Current Expense (Benefit) [Abstract]
Federal	$ 1,031	$ (36)	$ (2,368)
State	162	(176)	611
Total current expense (benefit)	1,193	(212)	(1,757)
Deferred Benefit [Abstract]
Federal	4,859	(10,115)	(6,065)
State	930	(2,175)	(2,120)
Total deferred expense (benefit)	5,789	(12,290)	(8,185)
Total expense (benefit) from continuing operations	6,982	(12,502)	(9,942)
Other comprehensive loss	(2,905)	(3,624)	(294)
Total comprehensive income tax expense (benefit)	$ 4,077	$ (16,126)	$ (10,236)