Stockholders' Equity and Stock-based Compensation (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expenses	$ 15,147	$ 11,988
Unrecognized Expense	140,662
Cost of license revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expenses	89	49
Cost of maintenance revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expenses	339	277
Cost of services revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expenses	4,363	3,513
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expenses	3,672	2,143
Sales and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expenses	3,430	2,987
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expenses	3,254	$ 3,019
Stock Options
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Unrecognized Expense	$ 4,444
Average Expected Recognition Period	2 years 1 month 6 days
Restricted Stock Units (RSUs)
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Unrecognized Expense	$ 136,218
Average Expected Recognition Period	2 years 8 months 12 days