Finite-Lived Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Cost	$ 78.9	$ 75.4
Accumulated Amortization	41.3	33.5
Net	$ 37.6	41.9
Developed technologies
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Period	10 years
Cost	$ 29.9	30.2
Accumulated Amortization	15.1	12.3
Net	$ 14.8	17.9
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Period	13 years
Cost	$ 47.1	44.2
Accumulated Amortization	25.2	20.3
Net	$ 21.9	23.9
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Period	3 years
Cost	$ 1.9	1.0
Accumulated Amortization	1.0	0.9
Net	$ 0.9	$ 0.1