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Summary of Fair Value of Assets Acquired and Liabilities Assumed by Major Class (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 07, 2012
Vela Systems [Member]
Jun. 07, 2012
Vela Systems [Member]
Developed technologies
Jun. 07, 2012
Vela Systems [Member]
Customer relationships
Jun. 07, 2012
Vela Systems [Member]
Trade name
Jun. 07, 2012
Vela Systems [Member]
User List
Jan. 31, 2013
Socialcam [Member]
Aug. 02, 2012
Socialcam [Member]
Aug. 02, 2012
Socialcam [Member]
Developed technologies
Aug. 02, 2012
Socialcam [Member]
Customer relationships
Aug. 02, 2012
Socialcam [Member]
Trade name
Aug. 02, 2012
Socialcam [Member]
User List
Oct. 04, 2012
Qontext [Member]
Oct. 04, 2012
Qontext [Member]
Developed technologies
Oct. 04, 2012
Qontext [Member]
Customer relationships
Oct. 04, 2012
Qontext [Member]
Trade name
Oct. 04, 2012
Qontext [Member]
User List
Dec. 21, 2012
PI VR [Member]
Dec. 21, 2012
PI VR [Member]
Developed technologies
Dec. 21, 2012
PI VR [Member]
Customer relationships
Dec. 21, 2012
PI VR [Member]
Trade name
Dec. 21, 2012
PI VR [Member]
User List
Jan. 31, 2013
Series of Individually Immaterial Business Acquisitions
Jan. 31, 2012
Series of Individually Immaterial Business Acquisitions
Jan. 31, 2013
Series of Individually Immaterial Business Acquisitions
Developed technologies
Jan. 31, 2012
Series of Individually Immaterial Business Acquisitions
Developed technologies
Jan. 31, 2013
Series of Individually Immaterial Business Acquisitions
Customer relationships
Jan. 31, 2012
Series of Individually Immaterial Business Acquisitions
Customer relationships
Jan. 31, 2013
Series of Individually Immaterial Business Acquisitions
Trade name
Jan. 31, 2012
Series of Individually Immaterial Business Acquisitions
Trade name
Jan. 31, 2013
Series of Individually Immaterial Business Acquisitions
User List
Jan. 31, 2012
Series of Individually Immaterial Business Acquisitions
User List
Jan. 31, 2012
Series of Individually Immaterial Business Acquisitions
Patent
Mar. 01, 2011
Scaleform Corporation
Mar. 01, 2011
Scaleform Corporation
Developed technologies
Mar. 01, 2011
Scaleform Corporation
Customer relationships
Mar. 01, 2011
Scaleform Corporation
Trade name
Mar. 01, 2011
Scaleform Corporation
User List
Mar. 01, 2011
Scaleform Corporation
Patent
Mar. 10, 2011
Blue Ridge Numerics, Inc
Mar. 10, 2011
Blue Ridge Numerics, Inc
Developed technologies
Mar. 10, 2011
Blue Ridge Numerics, Inc
Customer relationships
Mar. 10, 2011
Blue Ridge Numerics, Inc
Trade name
Mar. 10, 2011
Blue Ridge Numerics, Inc
User List
Mar. 10, 2011
Blue Ridge Numerics, Inc
Patent
Aug. 02, 2011
Instructables Corporation
Aug. 02, 2011
Instructables Corporation
Developed technologies
Aug. 02, 2011
Instructables Corporation
Customer relationships
Aug. 02, 2011
Instructables Corporation
Trade name
Aug. 02, 2011
Instructables Corporation
User List
Aug. 02, 2011
Instructables Corporation
Patent
Oct. 14, 2011
Micro Application Packages Limited
Oct. 14, 2011
Micro Application Packages Limited
Developed technologies
Oct. 14, 2011
Micro Application Packages Limited
Customer relationships
Oct. 14, 2011
Micro Application Packages Limited
Trade name
Oct. 14, 2011
Micro Application Packages Limited
User List
Oct. 14, 2011
Micro Application Packages Limited
Patent
Oct. 14, 2011
TurboSquid Corporation
Aug. 24, 2011
TurboSquid Corporation
Aug. 24, 2011
TurboSquid Corporation
Developed technologies
Oct. 14, 2011
TurboSquid Corporation
Customer relationships
Oct. 14, 2011
TurboSquid Corporation
Trade name
Oct. 14, 2011
TurboSquid Corporation
User List
Oct. 14, 2011
TurboSquid Corporation
Patent
Dec. 21, 2011
T-splines
Dec. 21, 2011
T-splines
Developed technologies
Dec. 21, 2011
T-splines
Customer relationships
Dec. 21, 2011
T-splines
Trade name
Dec. 21, 2011
T-splines
User List
Oct. 14, 2011
T-splines
Patent
Business Acquisition [Line Items]                                                                                                                                          
Intangible assets   $ 5.9 $ 3.6 $ 2.6 $ 0     $ 1.9 $ 0 $ 5.3 $ 22.3   $ 2.0 $ 0 $ 0 $ 0   $ 7.6 $ 6.7 $ 1.9 $ 0     $ 13.6 $ 21.7 $ 1.5 $ 3.9 $ 2.0 $ 1.2 $ 0 $ 0 $ 0   $ 5.9 $ 4.4 $ 1.4 $ 0 $ 3.6   $ 6.0 $ 9.2 $ 1.1 $ 0 $ 0   $ 0.4 $ 0.2 $ 1.6 $ 5.1 $ 0   $ 2.5 $ 2.0 $ 0.9 $ 0 $ 0     $ 26.0 $ 0 $ 0 $ 0 $ 0   $ 2.1 $ 0.7 $ 0.4 $ 0 $ 0
In-process research and development                                             0                   0.6           0.6           0           0           0             0          
Goodwill 57.5           23.0         24.0         36.8         46.1 28.3                   22.6           22.3           24.4           12.7               0         19.8          
Deferred Revenue 2.0           0         0         0.1         0 0                   0           1.2           0           0               0         0          
Deferred tax liability 3.9           (9.4)         0         (5.0)         0 0.2                   (2.5)           (3.6)           (1.6)           (1.6)           0             0          
Net tangible assets (liabilities) 4.5           (0.2)         0         0.7         0 (0.5)                   0.2           6.8           0.1           6.5           0             0          
Business acquisition, total cash consideration 76.0         42.9 59.5         26.0         48.6         63.2 54.8                   36.2           41.2           30.2           23.0                         23.0          
Acquired Finite-lived Intangible Asset, Amount                                                                                                                   $ 26.0