Employee Benefit and Retirement Plans (Schedule Of Allocation Of Plan Assets) (Details)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Plan asset target allocation	100.00%
Plan asset actual allocation	100.00%	100.00%
Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan asset target allocation	50.00%
Plan asset actual allocation	58.00%	50.00%
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan asset target allocation	50.00%
Plan asset actual allocation	42.00%	50.00%