Stockholders' Equity and Stock-based Compensation (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expenses	$ 8,272,000	$ 4,274,000	$ 28,430,000	$ 13,878,000
Expense reversal upon termination of executive officer			1,000,000
Unrecognized compensation cost, adjusted for estimated forfeitures	42,608,000		42,608,000
Cost of maintenance revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expenses	313,000	86,000	914,000	271,000
Cost of services revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expenses	3,150,000	907,000	9,205,000	2,648,000
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expenses	2,056,000	836,000	6,544,000	2,939,000
Sales and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expenses	676,000	905,000	4,269,000	1,929,000
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expenses	2,077,000	1,540,000	7,498,000	6,091,000
Restricted Stock Units (RSUs)
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Incremental Cost Of Modification of Award			1,000,000
Share-based Compensation Related to Successful IPO				1,200,000
Unrecognized compensation cost, adjusted for estimated forfeitures	39,165,000		39,165,000
Average Expected Recognition Period	1 year 3 months 29 days
Stock Options [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Unrecognized compensation cost, adjusted for estimated forfeitures	$ 3,443,000		$ 3,443,000
Average Expected Recognition Period	1 year 0 months 29 days