Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Oct. 31, 2013	Jul. 31, 2013
Intangible Assets by Major Class [Line Items]
Cost	$ 84.1	$ 74.5
Accumulated Amortization	20.9	19.0
Net	63.2	55.5
Developed Technology
Intangible Assets by Major Class [Line Items]
Cost	18.1	18.1
Accumulated Amortization	7.1	6.6
Net	11.0	11.5
Customer Relationships
Intangible Assets by Major Class [Line Items]
Cost	43.9	43.9
Accumulated Amortization	11.5	10.2
Net	32.4	33.7
Backlog
Intangible Assets by Major Class [Line Items]
Cost	2.1	2.1
Accumulated Amortization	2.1	2.1
Trade Names
Intangible Assets by Major Class [Line Items]
Cost	8.5	8.5
Accumulated Amortization	0.2	0.1
Net	8.3	8.4
In Process Research And Development
Intangible Assets by Major Class [Line Items]
Cost	11.5	1.9
Net	$ 11.5	$ 1.9