Debt (Details Textual) (USD $)	1 Months Ended	12 Months Ended			0 Months Ended
	Jun. 30, 2010	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012	Oct. 09, 2014
Debt Instrument [Line Items]
Unamortized discount		$ 8,824,000	$ 25,174,000
Convertible Notes (Textual) [Abstract]
Net current liability of convertible senior notes		342,499,000	324,826,000
Convertible Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued	350,000,000
Stated interest rate of Senior Notes		2.625%
Unamortized discount		7,500,000	25,174,000
Convertible Notes (Textual) [Abstract]
Principal amount outstanding		349,999,000	350,000,000
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		8,500,000
Unamortized Debt Discount expensed if convertible notes are converted		7,500,000
Unamortized Transaction Fees expensed if convertible notes are converted		1,000,000
If converted value of convertible senior notes		873,400,000
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.
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
Conversion rate of Convertible Senior Notes subject to certain conversion rate adjustments (in usd per share)		$ 7.55
Debt instrument principal amount conversion rate for specified shares of common stock		1,000
Total estimated fair value		873,900,000	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		523,900,000	306,800,000
Cost of 2015 Notes Hedges	76,600,000
Face value of notes tendered for early conversion		47,900,000
Estimated Fair Value of 2015 Notes hedges at the balance sheet date		523,900,000	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
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
Face value of notes tendered for early conversion and settled		1,000
Senior Notes [Member] | Senior Notes Due Twenty-Twenty Four [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued		350,000,000	0		350,000,000
Stated interest rate of Senior Notes					4.375%
Proceeds from Senior Notes, net					342,400,000
Unamortized discount		1,324,000	0		1,400,000
Debt issuance costs					$ 6,200,000