Net Restructuring and Related Charges (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		12 Months Ended
	May 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jul. 31, 2014	Jul. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ 3,500	$ 3,000	$ 500	$ 3,483	$ 3,519
2014 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net				2,900
2013 Acquisition Related Charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net				800	1,000
2013 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net				$ (200)	$ 2,500