Description of Business and Significant Accounting Policies - Additional Information (Detail)			12 Months Ended
	Apr. 29, 2015 USD ($) $ / shares shares	Apr. 07, 2015	Jul. 31, 2016 USD ($) Segment	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)	Jul. 31, 2013 USD ($)
Class of Stock [Line Items]
Proceeds from initial public offering, net of offering costs			$ (152,000)	$ 77,092,000	$ 0
Cash and cash equivalents, maturities			The Company considers all highly liquid instruments with original or remaining maturities of 90 days or less at the date of purchase to be cash equivalents.
Cash and cash equivalents			$ 68,303,000	89,562,000	51,759,000	$ 44,243,000
Goodwill impairment charges			0	0	0
Impairment of long-lived assets			$ 0	0	0
Standard product warranty description			The Company generally provides a warranty for its software products and services to its customers for periods ranging from one to six months.
Sales commission expense			$ 7,200,000	7,100,000	4,600,000
Advertising costs			$ 0	100,000	200,000
Number of operating segments | Segment			1
Minimum [Member]
Class of Stock [Line Items]
Property and equipment estimated useful life			3 years
Subscription and support revenue service period			1 year
Product warranty period			1 month
Maximum [Member]
Class of Stock [Line Items]
Property and equipment estimated useful life			5 years
Business combinations, measurement period			1 year
Subscription and support revenue service period			3 years
Product warranty period			6 months
Money market funds [Member]
Class of Stock [Line Items]
Cash and cash equivalents			$ 66,000,000	$ 86,400,000
Series H Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Gross proceeds from sale of common stock					$ 59,874,000
Convertible preferred stock converted into shares of common stock | shares	1.0365
IPO [Member]
Class of Stock [Line Items]
Common stock issued, share | shares	5,115,000
Issuance of common stock price per share | $ / shares	$ 17.00
Gross proceeds from sale of common stock	$ 87,000,000
Proceeds from initial public offering, net of offering costs	$ 76,900,000
Convertible preferred stock converted into shares of common stock | shares	19,818,172
Reverse stock split conversion ratio		0.1316
Reverse stock split, description			1-for-7.6