Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012
Current assets:
Cash and cash equivalents	$ 45,116	$ 74,367
Restricted cash	604	500
Short-term investments	96,408	50,834
Accounts receivable, net of allowance for doubtful accounts of $1,299 and $788, as of October 31, 2012 and April 30, 2012, respectively	22,465	17,977
Prepaid expenses and other current assets	4,293	3,873
Total current assets	168,886	147,551
Property, equipment, and capitalized internal-use software development costs, net	12,710	8,868
Goodwill	113,152
Acquired intangible assets, net	39,133
Other non-current assets	129	448
Total assets	334,010	156,867
Current liabilities:
Accounts payable	5,852	2,523
Accrued expenses and other current liabilities	16,931	12,725
Deferred revenue	47,185	42,152
Total current liabilities	69,968	57,400
Deferred revenue less current portion	2,317	3,434
Deferred tax liability, long-term	1,465	31
Other liabilities, long-term	2,390	2,404
Total liabilities	76,140	63,269
Commitments and contingencies (Note 9)
Stockholders' equity:
Common stock - $0.0001 par value; 150,000,000 shares authorized, 71,178,419 shares issued and 70,928,419 shares outstanding as of October 31, 2012; 150,000,000 shares authorized, 58,779,937 shares issued and 58,529,937 shares outstanding at April 30, 2012	7	6
Treasury stock, at cost - 250,000 shares at October 31, 2012 and April 30, 2012
Additional paid-in capital	352,807	158,769
Accumulated other comprehensive loss	(6)	(20)
Accumulated deficit	(94,938)	(65,157)
Total stockholders' equity	257,870	93,598
Total liabilities and stockholders' equity	$ 334,010	$ 156,867