Business and Summary of Significant Accounting Policies Changes In the Carrying Amount of Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Goodwill [Roll Forward]
Goodwill before accumulated impairments	831.6	703.3
Accumulated impairment losses	(149.2)	(149.2)
Goodwill	682.4	554.1
Goodwill, Translation and Purchase Accounting Adjustments	1.6	(1.8)
Goodwill before accumulated impairments	1,020.7	831.6	703.3
Accumulated impairment losses	(149.2)	(149.2)	(149.2)
Goodwill	871.5	682.4	554.1
Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill before accumulated impairments	76.6	45.3
Accumulated impairment losses	0	0
Goodwill	76.6	45.3
Goodwill, Translation and Purchase Accounting Adjustments	0.3	(0.7)
Goodwill before accumulated impairments	129.5	76.6
Accumulated impairment losses	0	0
Goodwill	129.5	76.6
Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill before accumulated impairments	247.7	224.2
Accumulated impairment losses	0	0
Goodwill	247.7	224.2
Goodwill, Translation and Purchase Accounting Adjustments	0.7	(1.2)
Goodwill before accumulated impairments	310.3	247.7
Accumulated impairment losses	0	0
Goodwill	310.3	247.7
Manufacturing
Goodwill [Roll Forward]
Goodwill before accumulated impairments	323.3	279.1
Accumulated impairment losses	0	0
Goodwill	323.3	279.1
Goodwill, Translation and Purchase Accounting Adjustments	0.6	0.1
Goodwill before accumulated impairments	389.9	323.3
Accumulated impairment losses	0	0
Goodwill	389.9	323.3
Media and Entertainment
Goodwill [Roll Forward]
Goodwill before accumulated impairments	184.0	154.7
Accumulated impairment losses	(149.2)	(149.2)
Goodwill	34.8	5.5
Goodwill, Translation and Purchase Accounting Adjustments	0	0
Goodwill before accumulated impairments	191.0	184.0
Accumulated impairment losses	(149.2)	(149.2)
Goodwill	41.8	34.8
Scaleform Corporation
Goodwill [Roll Forward]
Goodwill, Acquired During Period		22.6
Scaleform Corporation | Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Scaleform Corporation | Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Scaleform Corporation | Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Scaleform Corporation | Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period		22.6
Vela Systems [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	57.6
Vela Systems [Member] | Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Vela Systems [Member] | Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	57.6
Vela Systems [Member] | Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Vela Systems [Member] | Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Socialcam [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	23.0
Socialcam [Member] | Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	23.0
Socialcam [Member] | Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Socialcam [Member] | Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Socialcam [Member] | Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Qontext [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	24.0
Qontext [Member] | Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	24.0
Qontext [Member] | Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Qontext [Member] | Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Qontext [Member] | Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
PI VR [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	36.8
PI VR [Member] | Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
PI VR [Member] | Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
PI VR [Member] | Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	36.8
PI VR [Member] | Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Other Acquisitions
Goodwill [Roll Forward]
Goodwill, Acquired During Period	46.1	28.3
Other Acquisitions | Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	5.6	7.6
Other Acquisitions | Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	4.3	12.0
Other Acquisitions | Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	29.2	2.0
Other Acquisitions | Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	7.0	6.7
Blue Ridge Numerics, Inc
Goodwill [Roll Forward]
Goodwill, Acquired During Period		22.3
Blue Ridge Numerics, Inc | Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Blue Ridge Numerics, Inc | Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Blue Ridge Numerics, Inc | Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period		22.3
Blue Ridge Numerics, Inc | Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Instructables Corporation
Goodwill [Roll Forward]
Goodwill, Acquired During Period		24.4
Instructables Corporation | Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period		24.4
Instructables Corporation | Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Instructables Corporation | Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Instructables Corporation | Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Micro Application Packages Limited
Goodwill [Roll Forward]
Goodwill, Acquired During Period		12.7
Micro Application Packages Limited | Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Micro Application Packages Limited | Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period		12.7
Micro Application Packages Limited | Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
Micro Application Packages Limited | Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
T-splines [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		19.8
T-splines [Member] | Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
T-splines [Member] | Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
T-splines [Member] | Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period		19.8
T-splines [Member] | Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period		$ 0