Other Long-Term Liabilities (Schedule Of Other Long-Term Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Apr. 30, 2013
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	$ 1,352	$ 1,429
Other - Severance For French Employees [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	141	140
Other - Long Term Deferred Support Revenue [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	731	761
New York Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	90	101
New York Office [Member] | Unfavorable Lease Terms [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	115	131
San Francisco Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	81	82
New Jersey Office [Member] | Unfavorable Lease Terms [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	$ 194	$ 214