Debt (Details Textual) (USD $)					12 Months Ended				12 Months Ended				1 Months Ended	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 28, 2013 Revolving Credit Facility [Member]	Dec. 29, 2012 Revolving Credit Facility [Member]	Dec. 28, 2013 Convertible Senior Notes Due 2013 [Member]	Dec. 29, 2012 Convertible Senior Notes Due 2013 [Member]	Dec. 30, 2006 Convertible Senior Notes Due 2013 [Member]	Dec. 30, 2006 Convertible Notes Due Twenty-Eleven [Member]	Dec. 28, 2013 Notes Due Twenty-Thirteen [Member]	Dec. 28, 2013 Convertible Senior Notes Due 2011 [Member]	Dec. 31, 2011 Convertible Senior Notes Due 2011 [Member] Convertible Senior Notes Due 2013 [Member]	Dec. 30, 2006 Convertible Senior Notes Due 2011 [Member] Convertible Senior Notes Due 2013 [Member]	Jun. 30, 2010 Convertible Senior Notes Due 2015 [Member]	Dec. 28, 2013 Convertible Senior Notes Due 2015 [Member]	Dec. 29, 2012 Convertible Senior Notes Due 2015 [Member]	Dec. 31, 2011 Convertible Senior Notes Due 2015 [Member]	Dec. 28, 2013 Zero Coupon Zero Yield Senior Convertible Notes Due 2023 [Member]	Dec. 29, 2012 Zero Coupon Zero Yield Senior Convertible Notes Due 2023 [Member]	Aug. 31, 2003 Zero Coupon Zero Yield Senior Convertible Notes Due 2023 [Member]
Convertible Notes (Textual) [Abstract]
Principal amount, issued							$ 250,000,000	$ 250,000,000					$ 350,000,000						$ 420,000,000
Principal amount outstanding					0	144,461,000								350,000,000	350,000,000		0	178,000
Stated interest rate of Convertible Senior Notes					1.50%					1.375%				2.625%
Net current liability of convertible senior notes	324,826,000	447,011,000												324,800,000
Maturity date of Convertible Senior Notes									Dec. 15, 2013	Dec. 15, 2011				Jun. 01, 2015
Warrants to purchase shares of common stock price per share (in usd per share)					$ 31.50									$ 10.78
Conversion rate of Notes														132.5205 shares of common stock per $1,000 principal amount of notes, which is equivalent to a conversion price of approximately $7.55 per share of Cadence common stock.
Minimum closing price of common stock for specified days for conversion of notes (in usd per share)														$ 9.81
Minimum number of trading days limit for which closing price exceeds fixed price for conversion of notes														20 days
Number of final trading days range within which closing price exceeds the fixed price for conversion of notes														30 days
Total expense if convertible notes are converted														28,700,000
Unamortized Debt Discount expensed if convertible notes are converted														25,200,000
Unamortized Transaction Fees expensed if convertible notes are converted														3,500,000
Event 1														Closing stock price greater than $9.81 for at least 20 of the last 30 trading days in a fiscal quarter (convertible only for subsequent quarter);
Event 2														Specified corporate transactions;
Event 3														Note trading price falls below a calculated minimum.
Conversion rate of Convertible Senior Notes subject to certain conversion rate adjustments (in usd per share)														$ 7.55
Condition 1														Upon certain fundamental corporate changes prior to maturity, the 2015 Note holders could require Cadence to repurchase their notes for cash equal to the principal amount of the notes plus accrued interest. Upon certain fundamental changes prior to maturity, if Cadence's stock price were between $6.16 and $40.00 per share at that time, the holders of the notes would be entitled to an increase to the conversion rate. This is referred to as a "make-whole premium."
Minimum closing price of common stock to make whole premium in the form of increase to conversion rate (in usd per share)														$ 6.16
Maximum closing price of common stock to make whole premium in form of increase to conversion rate (in usd per share)														$ 40.00
Conversion rate for convertible senior notes per thousand principal amount of notes														132.5205
Debt instrument principal amount conversion rate for specified shares of common stock														1,000
If-converted value of Convertible Senior Notes														646,100,000
Total estimated fair value														654,100,000	640,100,000
Fair Value of 2015 Notes Embedded Conversion Derivative at the time of issuance													76,600,000
Estimated Fair Value of 2015 Notes Embedded Conversion Derivative at the balance sheet date														306,800,000	303,200,000
Cost of 2015 Notes Hedges													76,600,000
Estimated Fair Value of 2015 Notes hedges at the balance sheet date														306,800,000	303,200,000
Impact on Income statement related to fair value adjustments of 2015 Notes Embedded Conversion Derivative and 2015 Notes Hedges														0	0	0
Shares of Common Stock that can be purchased under warrants (in shares)												23,600,000		46,400,000
Amount received in cash proceeds from the sale of warrants												39,400,000	37,500,000
Notes Warrants expiration date description					various dates from February 2014 through April 2014					various dates from February 2012 through April 2012				various dates from September 2015 through December 2015
Number of shares underlying warrants purchased with purchase of 2011 Notes and 2013 Notes (in shares)											9,700,000
Cost for repurchase of portion of 2011 Notes and 2013 Notes Warrants											100,000
Reduction in number of shares available for purchase under warrants (in shares)										7,100,000
Line of Credit Facility, Amount Outstanding			$ 0	$ 0