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Cash, Cash Equivalents and Investments (Tables)
 12 Months Ended
Jan. 02, 2016
Cash, Cash Equivalents and Investments  
Schedule of cash, cash equivalents, and investments

 

        The Company's cash, cash equivalents and investments consisted of the following (in thousands):

 
   January 2, 2016  
 
   Cost   Gross
Unrealized
Losses		   Gross
Unrealized
Gains		   Fair Value  

Cash and Cash Equivalents:

                          

Cash on hand

   $ 59,071   $ —   $ —   $ 59,071  

Available-for-sale securities:

                 —        

Money market funds

     37,721     —     —     37,721  

Commercial Paper

     11,272     —     —     11,272  

Certificates of deposit

     2,845     —     —     2,845  

U.S. government agency

     1,599     —     —     1,599  

Municipal bond

     1,576     —     1     1,577  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total available-for-sale securities

     55,013     —     1     55,014  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash and cash equivalents

  
$
114,084		  
$
—		  
$
1		  
$
114,085		  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Short-term Investments:

    
 		    
 		    
 		    
 		  

Available-for-sale securities:

                          

Municipal bonds

   $ 93,506   $ (32 ) $ 42   $ 93,516  

Commercial Paper

     11,176     —     —     11,176  

Variable-rate demand notes

     8,995     —     —     8,995  

Certificates of deposit

     8,000     —     —     8,000  

U.S. government agency

     3,997     —     1     3,998  

International government bonds

     2,227     (7 )   —     2,220  

Corporate bonds

     999     (3 )   —     996  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total short-term investments

   $ 128,900   $ (42 ) $ 43   $ 128,901  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Long-term Investments:

    
 		    
 		    
 		    
 		  

Available-for-sale securities:

                          

Auction rate securities

   $ 8,000   $ (874 ) $ —   $ 7,126  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total long-term investments

   $ 8,000   $ (874 ) $ —   $ 7,126  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

 
   January 3, 2015  
 
   Cost   Gross
Unrealized
Losses		   Gross
Unrealized
Gains		   Fair Value  

Cash and Cash Equivalents:

                          

Cash on hand

   $ 52,144   $ —   $ —   $ 52,144  

Available-for-sale securities:

                          

Money market funds

     71,415     —     —     71,415  

Certificates of deposit

     7,739     —     —     7,739  

Commercial paper

     5,348     —     —     5,348  

Municipal bonds

     1,756     —     1     1,757  

U.S. government agency

     1,202     —     —     1,202  

Corporate bonds

     1,101     —     —     1,101  

U.S. government bonds

     1,000     —     —     1,000  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total available-for-sale securities

     89,561     —     1     89,562  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash and cash equivalents

  
$
141,705		  
$
—		  
$
1		  
$
141,706		  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Short-term Investments:

    
 		    
 		    
 		    
 		  

Available-for-sale securities:

                          

Municipal bonds

   $ 129,005   $ (25 ) $ 172   $ 129,152  

Corporate bonds

     33,043     (35 )   25     33,033  

Variable-rate demand notes

     12,915     —     —     12,915  

Commercial paper

     8,995     —     —     8,995  

Asset-backed securities

     5,380     (3 )   —     5,377  

International government bonds

     2,526     (10 )   —     2,516  

U.S. government bonds

     650     —     —     650  

U.S. government agency

     601     —     —     601  

Certificates of deposit

     250     —     —     250  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total short-term investments

   $ 193,365   $ (73 ) $ 197   $ 193,489  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Long-term Investments:

    
 		    
 		    
 		    
 		  

Available-for-sale securities:

                          

Auction rate securities

   $ 8,000   $ (581 ) $ —   $ 7,419  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total long-term investments

   $ 8,000   $ (581 ) $ —   $ 7,419  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of available-for-sale investments in continuous unrealized loss position by length of time

        The available-for-sale investments that were in a continuous unrealized loss position, aggregated by length of time that individual securities have been in a continuous loss position, were as follows (in thousands):

 
   Less Than 12 Months   12 Months or Greater   Total  
As of January 2, 2016
  Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		  

Municipal bonds

   $ 29,271   $ (30 ) $ 1,198   $ (2 ) $ 30,469   $ (32 )

Auction rate securities

     —     —     7,126     (874 )   7,126     (874 )

International government bonds

     2,220     (7 )   —     —     2,220     (7 )

Corporate bonds

     996     (3 )   —     —     996     (3 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 32,487   $ (40 ) $ 8,324   $ (876 ) $ 40,811   $ (916 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

 
   Less Than 12 Months   12 Months or Greater   Total  
As of January 3, 2015
  Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		  

Municipal bonds

   $ 23,735   $ (25 ) $ —   $ —   $ 23,735   $ (25 )

Corporate bonds

     20,327     (35 )   —     —     20,327     (35 )

Auction rate securities

     —     —     7,419     (581 )   7,419     (581 )

Asset-backed securities

     5,080     (3 )   —     —     5,080     (3 )

International government bond

     2,516     (10 )   —     —     2,516     (10 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 51,658   $ (73 ) $ 7,419   $ (581 ) $ 59,077   $ (654 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summarization of contractual underlying maturities of available-for-sale investments

 

        The following summarizes the contractual underlying maturities of the Company's available-for-sale investments at January 2, 2016 (in thousands):

 
   Cost   Fair
Value		  

Due in one year or less

   $ 150,455   $ 150,477  

Due after one year through ten years

     26,113     26,093  

Due after ten years

     15,345     14,471  
​ ​ ​ ​ ​ ​ ​ ​

 

   $ 191,913   $ 191,041  
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​