Net Restructuring Charges (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Apr. 30, 2016	Apr. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring, net	$ 182	$ 200	$ 1,000	$ 1,994	$ 1,000	$ 1,900	$ 1,429	$ 4,936
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Restructuring, net	$ 182			1,873			1,080	4,524
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring, net				$ 121			$ 349	$ 412