Other Long-Term Liabilities (Schedule Of Other Long-Term Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	$ 1,429	$ 1,148
Other - Severance For French Employees [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	140	123
Other - Long Term Deferred Support Revenue [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	761	252
Roseville Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent		83
New York Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	101	128
New York Office [Member] | Unfavorable Lease Terms [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	131	194
San Francisco Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	82	74
New Jersey Office [Member] | Unfavorable Lease Terms [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	$ 214	$ 294