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Commitments and Contingencies (Schedule Of Assets Capitalized Through Capital Leases) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Capital leased assets	$ 2,008	$ 2,008
Less accumulated depreciation	(1,532)	(1,216)
Property and equipment, net	476	792
Equipment [Member]
Capital leased assets	1,893	1,893
Furniture And Leasehold Improvements [Member]
Capital leased assets	$ 115	$ 115

Property, plant, or equipment held under lease agreements classified as an asset.

The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.