The Company and Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Sales taxes payable	$ 48,000,000		$ 36,000,000	$ 48,000,000
Impairments of goodwill and intangible assets	15,000,000	16,000,000		15,047,000	15,964,000
Major customer revenue percentage			21.00%	14.00%
Disclosure of major customers			For the year ended April 30, 2013, we had one customer that accounted for 21% of consolidated revenues. The customer constituted 16% of consolidated accounts receivable at April 30, 2013. The customer is in the eDiscovery segment. For the year ended April 30, 2012, the same customer accounted for 23% of consolidated revenues. The customer constituted 24% of consolidated accounts receivable at April 30, 2012. For the year ended April 30, 2011, the same customer accounted for 15% of consolidated revenues and another customer accounted for 14% of consolidated revenues. Those customers constituted 28% and 5%, respectively, of consolidated accounts receivable at April 30, 2011. Both customers are in the eDiscovery segment.
Unbilled accounts receivable			$1.6	$0.2
Revenue percentage from customers living in foreign countries			32	32	28
Forfeiture rate			20.00%	20.00%	20.00%
Accounts Receivable [Member]
Concentration risk percentage			16.00%		5.00%
Ediscovery [Member]
Impairments of goodwill and intangible assets				$ 1,500,000
Major customer revenue percentage				23.00%	15.00%
Ediscovery [Member] | Accounts Receivable [Member]
Concentration risk percentage				24.00%	28.00%
Maximum [Member]
Useful life			5 years
Minimum [Member]
Useful life			3 years