Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 19, 2013	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Business Acquisition [Line Items]
Goodwill		$ 14,744	$ 14,744	$ 14,744	$ 0
InsightsOne Systems, Inc. [Member]
Business Acquisition [Line Items]
Total purchase price	$ 17,100
Net tangible assets	700
Identifiable intangible assets	4,700
Liabilities and debt assumed	3,000
Goodwill	$ 14,700
InsightsOne Systems, Inc. [Member] | Restricted stock units [Member]
Business Acquisition [Line Items]
Shares issued by company	16,463
InsightsOne Systems, Inc. [Member] | Series G convertible preferred stock [Member]
Business Acquisition [Line Items]
Shares issued by company	511,538
InsightsOne Systems, Inc. [Member] | Series G-1 convertible preferred stock [Member]
Business Acquisition [Line Items]
Shares issued by company	681,792