Commitments And Contingencies (Schedule Of Assets Capitalized Through Capital Leases) (Details) - USD ($) $ in Thousands	Apr. 30, 2015	Apr. 30, 2014
Capital Leased Assets [Line Items]
Capital leased assets	$ 1,471	$ 1,471
Less accumulated depreciation	(1,399)	(1,094)
Property and equipment, net	72	377
Equipment [Member]
Capital Leased Assets [Line Items]
Capital leased assets	1,356	1,356
Furniture [Member]
Capital Leased Assets [Line Items]
Capital leased assets	$ 115	$ 115