Restructuring - Restructuring Reserve Roll Forward (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Restructuring Cost and Reserve [Line Items]
Beginning balance, July 31, 2012			$ 9,074
Restructuring charges	4,031	0	4,031	0
Non-cash write-offs			(200)
Cash payments			(7,088)
Ending balance, January 31, 2013	5,817		5,817
Employee Related [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, July 31, 2012			8,809
Restructuring charges			2,502
Non-cash write-offs			0
Cash payments			(6,955)
Ending balance, January 31, 2013	4,356		4,356
Asset Write-offs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, July 31, 2012			0
Restructuring charges	204		204
Non-cash write-offs			(200)
Cash payments			0
Ending balance, January 31, 2013	4		4
Other Restructuring Cost [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, July 31, 2012			265
Restructuring charges			1,325
Non-cash write-offs			0
Cash payments			(133)
Ending balance, January 31, 2013	$ 1,457		$ 1,457