Income Taxes (Schedule Of Reconciliation Between Income Tax Provision And Statutory Federal Tax Rate) (Details)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Income Tax Disclosure [Abstract]
U.S. statutory tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit	3.80%	4.00%	4.20%
Permanent differences	0.10%	(0.10%)	0.50%
Uncertain tax positions	(5.60%)	(4.10%)	(0.60%)
Change in valuation allowance	1.50%	(1.00%)	0.20%
Other	0.00%	(0.10%)	0.60%
Effective tax rate	34.80%	33.70%	39.90%