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Stock Compensation Plans and Stock Based Compensation (Details 6) (Restricted Stock [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 29, 2012
Restricted Stock [Member]
 
Summary of changes in restricted stock awards outstanding under Cadence's equity incentive plans  
Unvested shares as of December 31, 2011 7,827
Granted 6,078
Vested (4,033)
Forfeited (428)
Unvested shares as of December 29, 2012 9,444
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Unvested shares as of December 31, 2011, Weighted-Average Grant Date Fair Value $ 8.39
Granted, Weighted-Average Grant date Fair Value $ 11.33
Vested, Weighted-Average Grant Date Fair Value $ 8.02
Forfeited, Weighted-Average Grant Date Fair Value $ 9.07
Unvested shares as of December 29, 2012, Weighted-Average Grant Date Fair Value $ 10.40
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
Unvested shares expected to vest as of December 29, 2012 8,869
Unvested shares expected to vest as of December 29, 2012, Weighted-Average Grant Date Fair Value $ 10.38
Unvested shares as of December 29, 2012, Weighted-Average Remaining Vesting Terms 1 year 2 months 12 days
Unvested shares expected to vest as of December 29, 2012, Weighted-Average Remaining Vesting Terms 1 year 2 months 12 days
Unvested shares as of December 29, 2012, Aggregate Intrinsic Value $ 126,928
Unvested shares expected to vest as of December 29, 2012, Aggregate Intrinsic Value $ 119,206