Net Restructuring Charges (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring, net	$ 776	$ 240	$ 2,150	$ 1,247
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Restructuring, net	154	83	735	898
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring, net	$ 622	$ 157	$ 1,415	$ 349