Income Taxes (Details) (USD $) In Thousands	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Income (loss) before income tax provision
Domestic	$ 25	$ (36,628)	$ (24,762)
International	(972)	3,358	2,137
Loss before provision for (benefit from) income taxes	(947)	(33,270)	(22,625)
Current
Federal	(126)	(283)	15
State	99	231	260
Foreign	1,241	874	513
Total current provision for income taxes	1,213	822	788
Deferred
Federal	(59,614)	(85)	0
State	(12,428)	(9)	0
Foreign	(806)	0	0
Total deferred provision for income taxes	(72,848)	(94)	0
Total provision for income taxes	(71,635)	728	788
Deferred tax assets
Valuation allowance	200
Net deferred tax assets	73,453	0
Deferred tax liabilities
Net deferred tax asset (liability)	72,638	0
Deferred Tax Current [Member]
Deferred tax assets
Net operating loss carryforwards	24,295	0
Capital loss	75	0
Research and development credits	6,255	0
Accruals and reserves	22,992	31,373
Total deferred tax assets	53,618	31,373
Valuation allowance	(235)	(31,279)
Unrealized loss in other comprehensive income	(73)	(94)
Net deferred tax assets	53,310	0
Deferred Tax Non-current [Member]
Deferred tax assets
Net operating loss carryforwards	0	18,504
Capital loss	0	77
Research and development credits	14,119	11,653
Depreciation and amortization	0	345
Accruals and reserves	6,024	5,714
Total deferred tax assets	20,143	36,293
Valuation allowance	0	(36,293)
Net deferred tax assets	20,143	0
Deferred tax liabilities
Depreciation and amortization	(808)	0
Book/tax basis in acquired assets	(7)	0
Total deferred tax liabilities	$ (815)	$ 0