Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Income Taxes [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Tax basis adjustment	0.00%	0.00%	(1.70%)
Meals and entertainment	0.80%	1.50%	(0.80%)
Domestic production deduction	(1.80%)	(0.30%)	0.00%
Other	0.70%	1.40%	0.00%
Total	(0.30%)	2.60%	(2.50%)
Effective federal income tax rate	34.70%	37.60%	32.50%
State income taxes, net of federal tax effect	4.50%	4.10%	5.10%
Effective income tax rate	39.20%	41.70%	37.60%
Income taxes paid	$ 4,334	$ 1,219	$ 229