Restructuring - Restructuring Reserve Roll Forward (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 4,879	$ 0	$ 9,157
Non-cash write-offs			$ 0	$ (896)