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Debt (Details Textual)
$ in Thousands
12 Months Ended
Jan. 28, 2016
USD ($)
Oct. 09, 2014
USD ($)
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
Jan. 03, 2015
USD ($)
Debt Instrument [Line Items]          
Unamortized discount     $ 6,507 $ 6,712  
Payments of convertible debt     0 349,999 $ 1
Cash paid for interest     (21,024) (19,918) (9,963)
Payments for convertible notes embedded conversion derivative liability     0 530,643 1
Proceeds from convertible notes hedges     $ 0 530,643 $ 1
Long-term Debt [Member] | Term Loan Due 2019 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate Terms     Amounts initially accrue interest at a rate equal to LIBOR plus a margin of 1.125% per annum, which may increase to a rate equal to LIBOR plus a margin of up to 1.875% per annum, depending on Cadence’s leverage ratio.    
Aggregate principal amount issued $ 300,000   $ 300,000 0  
Debt instrument, term 3 years        
Debt Instrument, Covenant, Required Business Acquisition Consideration, Minimum     250,000    
Unamortized discount     $ 434 0  
Debt instrument, covenant description     The covenants of the term loan are generally consistent with Cadence’s existing five-year senior unsecured revolving credit facility. In addition, the term loan agreement contains certain financial covenants that require Cadence to maintain a funded debt-to-EBITDA ratio not greater than 2.75 to 1, with a step-up to 3.25 to 1 for one year following an acquisition by Cadence of at least $250.0 million that results in a pro forma leverage ratio between 2.50 to 1 and 3.00 to 1.    
Senior Notes [Member] | Senior Notes Due 2024 [Member]          
Debt Instrument [Line Items]          
Aggregate principal amount issued   $ 350,000 $ 350,000 350,000  
Stated interest rate of Senior Notes   4.375%      
Proceeds from Senior Notes, net   $ 342,400      
Unamortized discount   1,400 $ 6,073 $ 6,712  
Debt issuance costs   $ 6,200      
London Interbank Offered Rate (LIBOR) [Member] | Long-term Debt [Member] | Term Loan Due 2019 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, interest rate at period end     2.29%    
Minimum [Member] | Long-term Debt [Member] | Term Loan Due 2019 [Member]          
Debt Instrument [Line Items]          
Debt instrument, covenant, debt to EBITDA ratio     2.75    
Pro forma leverage ratio     2.50    
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Long-term Debt [Member] | Term Loan Due 2019 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, interest rate spread     1.125%    
Maximum [Member] | Long-term Debt [Member] | Term Loan Due 2019 [Member]          
Debt Instrument [Line Items]          
Debt instrument, covenant, debt to EBITDA ratio     3.25    
Pro forma leverage ratio     3.00    
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Long-term Debt [Member] | Term Loan Due 2019 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, interest rate spread     1.875%