Intangible Assets (Detail) - USD ($) $ in Thousands		12 Months Ended
		Jul. 31, 2015	Jul. 31, 2014
Intangible Assets by Major Class [Line Items]
Cost		$ 83,000	$ 82,000
Accumulated Amortization		33,500	24,600
Net		$ 49,499	57,366
Developed technologies
Intangible Assets by Major Class [Line Items]
Weighted-Average Amortization Period		10 years
Cost		$ 30,200	29,600
Accumulated Amortization		12,300	9,000
Net		$ 17,900	20,600
Customer relationships
Intangible Assets by Major Class [Line Items]
Weighted-Average Amortization Period		13 years
Cost		$ 44,200	43,900
Accumulated Amortization		20,300	15,100
Net		$ 23,900	28,800
Trade names
Intangible Assets by Major Class [Line Items]
Weighted-Average Amortization Period	[1]	3 years
Cost	[1]	$ 8,600	8,500
Accumulated Amortization	[1]	900	500
Net	[1]	$ 7,700	$ 8,000

[1] $7.6 Million of trade names are indefinite-lived, $0.1 Million and $0.4 Million are finite-lived trade names for 2015 and 2014, respectively.