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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 29, 2014
Subsequent Event [Abstract]
SUBSEQUENT EVENT	SUBSEQUENT EVENT On April 18, 2014, Cadence entered into an agreement to acquire Jasper Design Automation, Inc., or Jasper, a provider of formal analysis solutions, for approximately $170.0 million in cash. Jasper had approximately $24.0 million of cash, cash equivalents and short-term investments as of December 31, 2013. The completion of the transaction is subject to certain conditions, including regulatory approval.