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Debt (Tables)
 12 Months Ended
Dec. 29, 2018
Debt  
Summary of information about the equity and liability components of the convertible senior notes

        The carrying amount of the Notes consisted of the following (in thousands):

 
   December 29,
2018		   December 30,
2017		  

Liability component

              

Principal

   $ 400,000   $ 400,000  

Unamortized debt discount

     (39,298 )   (50,499 )

Unamortized debt issuance costs

     (5,931 )   (7,622 )
​ ​ ​ ​ ​ ​ ​ ​

Net carrying amount

   $ 354,771   $ 341,879  
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Equity component

              

Net carrying amount

   $ 57,735   $ 57,735  
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Schedule of components of interest expense

        Interest expense related to the Notes was comprised of the following (in thousands):

 
   Year Ended  
 
   December 29,
2018		   December 30,
2017		  

Contractual interest expense

   $ 5,500   $ 4,492  

Amortization of debt discount

     11,202     8,816  

Amortization of debt issuance costs

     1,690     1,330  
​ ​ ​ ​ ​ ​ ​ ​

  $ 18,392   $ 14,638  
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