Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2014	Jul. 31, 2013
Intangible Assets by Major Class [Line Items]
Cost	$ 84.1	$ 74.5
Accumulated Amortization	22.8	19.0
Net	61.3	55.5
Developed technologies
Intangible Assets by Major Class [Line Items]
Cost	18.1	18.1
Accumulated Amortization	7.7	6.6
Net	10.4	11.5
Customer relationships
Intangible Assets by Major Class [Line Items]
Cost	43.9	43.9
Accumulated Amortization	12.7	10.2
Net	31.2	33.7
Backlog
Intangible Assets by Major Class [Line Items]
Cost	2.1	2.1
Accumulated Amortization	2.1	2.1
Tradenames
Intangible Assets by Major Class [Line Items]
Cost	8.5	8.5
Accumulated Amortization	0.3	0.1
Net	8.2	8.4
In-process research and development
Intangible Assets by Major Class [Line Items]
Cost	11.5	1.9
Net	$ 11.5	$ 1.9