Consolidated Balance Sheets (USD $) In Thousands	Jul. 31, 2011	Jul. 31, 2010
Current assets
Cash and cash equivalents	$ 80,773	$ 31,254
Short-term investments	153,185	124,167
Accounts receivable, net	68,598	41,269
Inventory	29,895	15,159
Deferred costs	6,999	5,451
Prepaids and other	5,097	5,108
Deferred income tax assets	53,310	0
Total current assets	397,857	222,408
Property and equipment, net	14,772	9,919
Goodwill	33,143	7,656
Intangible assets, net	20,863	9,287
Deferred income tax assets	20,143	0
Other assets	2,093	1,437
Total assets	488,871	250,707
Current liabilities
Accounts payable	11,278	8,082
Accrued liabilities	61,461	36,458
Income taxes payable	767	519
Deferred revenue, current	54,451	43,422
Total current liabilities	127,957	88,481
Deferred income tax liability	815	0
Deferred revenue, long-term	14,000	10,976
Other long-term liabilities	757	595
Total liabilities	143,529	100,052
Commitments and contingencies (Note 12)
Stockholders' equity
Common stock: $0.0001 par value; 350,000 shares authorized at July 31, 2011 and 2010 , respectively; 104,905 and 93,606 shares issued and outstanding at July 31, 2011 and 2010, respectively	10	9
Additional paid-in capital	450,147	326,178
Accumulated other comprehensive income	127	98
Accumulated deficit	(104,942)	(175,630)
Total stockholders' equity	345,342	150,655
Total liabilities and stockholders' equity	$ 488,871	$ 250,707