Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Jul. 31, 2014
Computer And Telecommunications Equipment | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property Plant and Equipment Useful Life	2 years
Computer And Telecommunications Equipment | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property Plant and Equipment Useful Life	3 years
Computer Software
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property Plant and Equipment Useful Life	3 years
Furniture And Office Equipment
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property Plant and Equipment Useful Life	5 years
Leasehold Improvements
Property Plant and Equipment Estimated Useful Lives [Line Items]
Leasehold improvements	Shorter of lease term or useful life of asset