Debt (Details Textual) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2010	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013	Dec. 28, 2013
Convertible Notes (Textual) [Abstract]
Net current liability of convertible senior notes		$ 333,333,000		$ 333,333,000		$ 324,826,000
Convertible Senior Notes Due 2015 [Member]
Convertible Notes (Textual) [Abstract]
Principal amount, issued	350,000,000
Principal amount outstanding		350,000,000		350,000,000		350,000,000
Stated interest rate of convertible senior notes		2.625%		2.625%
Maturity date of convertible senior notes				Jun. 01, 2015
Warrants to purchase shares of common stock price per share (in usd per share)				$ 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				19,000,000
Unamortized debt discount expensed if convertible notes are converted				16,700,000
Unamortized transaction fees expensed if convertible notes are converted				2,300,000
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		$ 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 2015 notes holder 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		804,300,000		804,300,000
Total estimated fair value		807,700,000		807,700,000		654,100,000
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		455,800,000		455,800,000		306,800,000
Cost of 2015 Notes Hedges	76,600,000
Estimated fair value of 2015 Notes hedges at the balance sheet date		455,800,000		455,800,000		306,800,000
Impact on Income statement related to fair value adjustments of 2015 Notes Embedded Conversion Derivative and 2015 Notes Hedges		0	0	0	0
Shares of common stock that can be purchased under warrants (in shares)				46,400,000
Amount received in cash proceeds from the sale of warrants	$ 37,500,000
Notes Warrants expiration date description				various dates from September 2015 through December 2015