Acqusitions and Acquisition-Related Contingent Consideration (Details) (Sigrity [Member], USD $) In Thousands, unless otherwise specified	Jul. 02, 2012
Business Acquisition Purchase Price Allocation [Line Items]
Cash and cash equivalents	$ 7,490
Trade receivables	4,254
Property, plant and equipment	238
Other assets	1,004
Goodwill	39,680
Total assets acquired	93,266
Deferred revenue	(3,800)
Other liabilities	(2,547)
Long-term deferred tax liabilities	(15,079)
Net assets acquired	71,840
Existing Technology
Business Acquisition Purchase Price Allocation [Line Items]
Acquired intangibles:	22,200
Agreements and relationships
Business Acquisition Purchase Price Allocation [Line Items]
Acquired intangibles:	17,100
Tradenames and trademarks
Business Acquisition Purchase Price Allocation [Line Items]
Acquired intangibles:	$ 1,300