Other Intangible Assets and Related Accumulated Amortization (Detail) (USD $) In Millions, unless otherwise specified	Oct. 31, 2011		Jan. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Developed technologies, at cost	$ 374.3	[1]	$ 313.1	[1]
Customer relationships and trade names, at cost	213.9	[2]	179.1	[2]
Finite-Lived Intangible Assets, Gross, Total	588.2		492.2
Less: Accumulated amortization	(427.1)		(373.4)
Other intangible assets, net	$ 161.1		$ 118.8

[1] Developed technologies include $1.2 million and zero of in-process research and development technology as of October 31, 2011 and January 31, 2011, respectively. In-process research and development is an indefinite lived asset that is held and tested at least annually for impairment until such time that it becomes fully developed technology. Once completed, the technology is amortized to expense over an applicable useful life.

[2] Included in "Other assets" in the accompanying Condensed Consolidated Balance Sheets. Customer relationships and trade names include the effects of foreign currency translation.