Segment Information (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Segment Reporting Information [Line Items]
Revenues	$ 9,770	$ 10,440	$ 10,345	$ 9,638	$ 9,811	$ 11,069	$ 11,075	$ 11,514	$ 40,193	$ 43,469	$ 46,993
Operating Expenses									37,878	56,528	60,724
Operating Income (Loss)	762	367	902	284	(15,706)	604	1,198	845	2,315	(13,059)	(13,731)
Assets	39,707				41,869				39,707	41,869
Ediscovery [Member]
Segment Reporting Information [Line Items]
Revenues									16,281	19,981	23,112
Operating Expenses									16,336	19,979	16,241
Operating Income (Loss)									(55)	2	6,871
Assets	27,700				29,657				27,700	29,657
Database, Archive And Migration [Member]
Segment Reporting Information [Line Items]
Revenues									23,912	23,488	23,881
Operating Expenses									15,304	14,786	18,557
Operating Income (Loss)									8,608	8,702	5,324
Assets	12,007				12,212				12,007	12,212
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating Expenses									6,238	21,763	25,926
Operating Income (Loss)									$ (6,238)	$ (21,763)	$ (25,926)