Subsequent Event	6 Months Ended
Jun. 30, 2012
Subsequent Events [Abstract]
SUBSEQUENT EVENT	NOTE 16. SUBSEQUENT EVENT On July 2, 2012, Cadence acquired Sigrity, Inc., or Sigrity, a provider of signal and power integrity analysis tools for system, printed circuit board and integrated circuit package design, for cash consideration of approximately $78.3 million, net of cash acquired of approximately $7.8 million. The consideration includes approximately $14.2 million of cash payments that were deferred on the acquisition date and are conditioned upon certain Sigrity shareholders remaining employees of Cadence over designated retention periods. Cadence will expense the $14.2 million over the designated retention periods. The remaining consideration of approximately $64.1 million will be allocated based on the fair value of the net assets acquired. Cadence is in the process of determining the fair value of the net assets acquired and will include Sigrity’s results of operations in its financial statements with effect from the purchase date. Comparative pro forma financial information for this acquisition has not been presented because the results of operations were not material to Cadence’s Condensed Consolidated Financial Statements.

Subsequent Event

6 Months Ended

Jun. 30, 2012

NOTE 16. SUBSEQUENT EVENT

On July 2, 2012, Cadence acquired Sigrity, Inc., or Sigrity, a provider of signal and power integrity analysis tools for system, printed circuit board and integrated circuit package design, for cash consideration of approximately $78.3 million, net of cash acquired of approximately $7.8 million. The consideration includes approximately $14.2 million of cash payments that were deferred on the acquisition date and are conditioned upon certain Sigrity shareholders remaining employees of Cadence over designated retention periods. Cadence will expense the $14.2 million over the designated retention periods. The remaining consideration of approximately $64.1 million will be allocated based on the fair value of the net assets acquired. Cadence is in the process of determining the fair value of the net assets acquired and will include Sigrity’s results of operations in its financial statements with effect from the purchase date. Comparative pro forma financial information for this acquisition has not been presented because the results of operations were not material to Cadence’s Condensed Consolidated Financial Statements.