Segment Information and Information About Geographic Areas - Summary of Long-lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 18,832	$ 21,088
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	18,421	20,252
Rest of the World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 411	$ 836