Changes in the Carrying Amount of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended																	9 Months Ended
	Oct. 31, 2011	Oct. 31, 2011 Scaleform Corporation	Oct. 31, 2011 Blue Ridge Numerics, Inc	Oct. 31, 2011 Instructables Corporation	Oct. 31, 2011 Micro Application Packages Limited	Oct. 31, 2011 Other Acquisitions	Oct. 31, 2011 Platform Solutions and Emerging Business	Oct. 31, 2011 Platform Solutions and Emerging Business Instructables Corporation	Oct. 31, 2011 Platform Solutions and Emerging Business Other Acquisitions	Oct. 31, 2011 Architecture, Engineering and Construction	Oct. 31, 2011 Architecture, Engineering and Construction Micro Application Packages Limited	Oct. 31, 2011 Architecture, Engineering and Construction Other Acquisitions	Oct. 31, 2011 Manufacturing	Oct. 31, 2011 Manufacturing Blue Ridge Numerics, Inc	Oct. 31, 2011 Manufacturing Other Acquisitions	Oct. 31, 2011 Media and Entertainment	Jan. 31, 2011 Media and Entertainment	Oct. 31, 2011 Media and Entertainment Scaleform Corporation	Oct. 31, 2011 Media and Entertainment Other Acquisitions
Goodwill [Line Items]
Goodwill before accumulated impairment losses beginning balance	$ 703.3						$ 45.3			$ 224.2			$ 279.1			$ 180.8	$ 154.7
Accumulated impairment losses beginning balance	(149.2)															(149.2)	(149.2)
Beginning Balance	554.1						45.3			224.2			279.1			31.6	5.5
Effect of foreign currency translation, purchase accounting and other	1.9						0.1			0.9			0.9
Goodwill before accumulated impairment losses ending balance	803.1						77.4			240.6			304.3			180.8	154.7
Accumulated impairment losses ending balance	(149.2)															(149.2)	(149.2)
Ending Balance	653.9						77.4			240.6			304.3			31.6	5.5
Addition arising from acquisition		$ 22.6	$ 22.3	$ 24.4	$ 12.7	$ 15.9		$ 24.4	$ 7.6		$ 12.7	$ 2.8		$ 22.3	$ 2.0			$ 22.6	$ 3.5