Employee Benefit And Retirement Plans (Schedule Of Allocation Of Plan Assets) (Details)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Plan asset actual allocation	100.00%	100.00%
Plan asset target allocation	100.00%
Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan asset actual allocation	50.00%	50.20%
Plan asset target allocation	50.00%
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan asset actual allocation	50.00%	49.80%
Plan asset target allocation	50.00%