Allocation of the Purchase Price Consideration for Blue Ridge (Detail) (Blue Ridge Numerics, Inc, USD $) In Millions	Mar. 10, 2011
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
In-process research and development	$ 0.6
Goodwill	22.3
Deferred revenue	(1.2)
Deferred tax liability	(3.6)
Net tangible assets	6.8
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net, Total	41.2
Developed technologies
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	6.0
Customer relationships
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	9.2
Trade name
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	$ 1.1