The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified							12 Months Ended	1 Months Ended
	Mar. 01, 2011 Scaleform Corporation	Mar. 10, 2011 Blue Ridge Numerics, Inc	Aug. 02, 2011 Instructables Corporation	Aug. 24, 2011 TurboSquid Corporation	Oct. 14, 2011 Micro Application Packages Limited	Dec. 21, 2011 T-splines	Jan. 31, 2012 Series of Individually Immaterial Business Acquisitions	Aug. 24, 2011 Maximum
Business Acquisition [Line Items]
Business acquisition, number of acquisitions							17
Business acquisition, total cash consideration	$ 36.2	$ 41.2	$ 30.2	$ 26.0	$ 23.0	$ 23.0	$ 54.8
Related cross-licensing and commercial arrangement, expense								$ 0.2