Property and Equipment - Components of property and equipment, net (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Apr. 30, 2013
Property, Plant and Equipment [Abstract]
Land	$ 726	$ 726
Building and leasehold improvements	5,059	7,391
Furniture and equipment	5,261	11,180
Property and equipment, gross	11,046	19,297
Accumulated depreciation and amortization	(7,109)	(15,367)
Total property and equipment, net	$ 3,937	$ 3,930