Net Restructuring Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jan. 31, 2013	Oct. 31, 2012	Jan. 31, 2012		Jan. 31, 2013	Jan. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring, net	$ 4,798	$ 1,500	$ 4,463	[1]	$ 6,268	$ 5,219	[1]
Cost Of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring, net	3,529		3,710		4,298	4,139
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring, net	$ 1,269		$ 753		$ 1,970	$ 1,080

[1] As Restated