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Debt (Tables)
 12 Months Ended
Dec. 30, 2017
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 30,
2017		  

Liability component

        

Principal

   $ 400,000  

Unamortized debt discount

     (50,499 )

Unamortized debt issuance costs

     (7,622 )
​ ​ ​ ​ ​

Net carrying amount

   $ 341,879  
​ ​ ​ ​ ​
​ ​ ​ ​ ​
​ ​ ​ ​ ​

Equity component

        

Net carrying amount

   $ 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 30,
2017		  

Contractual interest expense

   $ 4,492  

Amortization of debt discount

     8,816  

Amortization of debt issuance costs

     1,330  
​ ​ ​ ​ ​

  $ 14,638  
​ ​ ​ ​ ​
​ ​ ​ ​ ​
​ ​ ​ ​ ​