Allocation of the Purchase Price Consideration for Blue Ridge (Parenthetical) (Detail) (Blue Ridge Numerics, Inc)	3 Months Ended
Apr. 30, 2011 Year
Developed technologies
Business Acquisition [Line Items]
Intangible assets, useful life (in years)	3
Customer relationships
Business Acquisition [Line Items]
Intangible assets, useful life (in years)	4
Trade name
Business Acquisition [Line Items]
Intangible assets, useful life (in years)	3

The useful life of all finite-lived intangible assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 12, 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 35
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6904245&loc=d3e15372-109273

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Namespace Prefix:	us-gaap
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration