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Debt (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 12 Months Ended
Oct. 09, 2014
Jun. 30, 2010
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Debt Instrument [Line Items]          
Payments of convertible debt     $ 349,999 $ 1 $ 144,639
Cash paid for interest     (19,918) (9,963) (12,429)
Payments for convertible notes embedded conversion derivative liability     530,643 1 0
Proceeds from convertible notes hedges     $ 530,643 1 $ 0
Issuance of common shares for settlement of warrants     23.1    
Unamortized discount     $ 1,212 8,824  
Senior Notes [Member] | Convertible Senior Notes Due 2015 [Member]          
Debt Instrument [Line Items]          
Aggregate principal amount issued   $ 350,000      
Stated interest rate of Senior Notes     2.625%    
Payments of convertible debt     $ 350,000    
Cash paid for interest     (3,800)    
Payments for convertible notes embedded conversion derivative liability     530,600    
Proceeds from convertible notes hedges     $ 530,600    
Shares of common stock that can be purchased under warrants (in shares)     46.4    
Warrants to purchase shares of common stock price per share (in usd per share)     $ 10.78    
Amount received in cash proceeds from the sale of warrants   $ 37,500      
Unamortized discount     $ 0 7,500  
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   $ 1,212 $ 1,324  
Debt issuance costs $ 6,200