Goodwill Changes in the Carrying Amount of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		3 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended											3 Months Ended	9 Months Ended
	Oct. 31, 2012 ReportingUnits	Jan. 31, 2012	Oct. 31, 2012 Platform Solutions and Emerging Business [Member]	Jan. 31, 2012 Platform Solutions and Emerging Business [Member]	Oct. 31, 2012 Architecture, Engineering and Construction [Member]	Jan. 31, 2012 Architecture, Engineering and Construction [Member]	Oct. 31, 2012 Manufacturing [Member]	Jan. 31, 2012 Manufacturing [Member]	Oct. 31, 2012 Media and Entertainment [Member]	Jan. 31, 2012 Media and Entertainment [Member]	Oct. 31, 2012 Vela Systems [Member]	Oct. 31, 2012 Vela Systems [Member] Platform Solutions and Emerging Business [Member]	Oct. 31, 2012 Vela Systems [Member] Architecture, Engineering and Construction [Member]	Oct. 31, 2012 Vela Systems [Member] Manufacturing [Member]	Oct. 31, 2012 Vela Systems [Member] Media and Entertainment [Member]	Oct. 31, 2012 Socialcam [Member]	Oct. 31, 2012 Socialcam [Member] Platform Solutions and Emerging Business [Member]	Oct. 31, 2012 Socialcam [Member] Architecture, Engineering and Construction [Member]	Oct. 31, 2012 Socialcam [Member] Manufacturing [Member]	Oct. 31, 2012 Socialcam [Member] Media and Entertainment [Member]	Oct. 31, 2012 Series of Individually Immaterial Business Acquisitions [Member]	Oct. 31, 2012 Series of Individually Immaterial Business Acquisitions [Member] Platform Solutions and Emerging Business [Member]	Oct. 31, 2012 Series of Individually Immaterial Business Acquisitions [Member] Architecture, Engineering and Construction [Member]	Oct. 31, 2012 Series of Individually Immaterial Business Acquisitions [Member] Manufacturing [Member]	Oct. 31, 2012 Series of Individually Immaterial Business Acquisitions [Member] Media and Entertainment [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period											$ 57.6	$ 0	$ 57.6	$ 0	$ 0	$ 23.0	$ 23.0	$ 0	$ 0	$ 0	$ 38.3	$ 2.1	$ 0	$ 29.2	$ 7.0
Goodwill before accumulated impairment losses beginning balance	831.6			76.6	247.7		323.3		184.0
Accumulated impairment losses beginning balance	(149.2)			0	0		0		(149.2)
Goodwill	824.6	682.4	125.4	76.6	305.3	247.7	352.1	323.3	41.8	34.8
Effect of foreign currency translation, purchase accounting and other	(0.7)		(0.3)		0		(0.4)		0
Goodwill before accumulated impairment losses ending balance	973.8		125.4	76.6	305.3		352.1		191.0
Accumulated impairment losses ending balance	$ (149.2)		$ 0	$ 0	$ 0		$ 0		$ (149.2)
Number of reporting units (presented as an integer)	4