Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2014		May 31, 2014	Jul. 31, 2013
Intangible Assets by Major Class [Line Items]
Cost	$ 82.0			$ 72.4
Accumulated Amortization	24.6			16.9
Net	57.4			55.5
Developed technologies
Intangible Assets by Major Class [Line Items]
Weighted-Average Amortization Period	10 years
Cost	29.6		11.5	18.1
Accumulated Amortization	9.0			6.6
Net	20.6			11.5
Customer relationships
Intangible Assets by Major Class [Line Items]
Weighted-Average Amortization Period	13 years
Cost	43.9			43.9
Accumulated Amortization	15.1			10.2
Net	28.8			33.7
Tradenames
Intangible Assets by Major Class [Line Items]
Weighted-Average Amortization Period	3 years	[1]
Cost	8.5			8.5
Accumulated Amortization	0.5			0.1
Net	8.0			8.4
In-process research and development
Intangible Assets by Major Class [Line Items]
Cost				1.9
Net				$ 1.9

[1] $7.6 Million of Trade names are Non-Amortizable