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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 30, 2017
Fair Value of Financial Instruments  
Financial assets and liabilities measured at fair value on a recurring basis

 
   Fair Value Measurements
at December 30, 2017 Using		    
  
Description
  Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		   Significant Other
Observable
Inputs
(Level 2)		   Significant
Unobservable
Inputs
(Level 3)		   Total  

Assets:

                          

Cash equivalents:

                          

Money market funds

   $ 106,047   $ —   $ —   $ 106,047  

Corporate debt securities

     —     11,231     —     11,231  

Government debt securities

     53,615     1,453     —     55,068  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash equivalents

   $ 159,662   $ 12,684   $ —   $ 172,346  

Short-term investments:

    
 		    
 		    
 		    
 		  

Government debt securities

   $ 94,575   $ 228,247   $ —   $ 322,822  

Corporate debt securities

     —     171,835     —     171,835  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total short-term investments

   $ 94,575   $ 400,082   $ —   $ 494,657  

Other assets, net:

    
 		    
 		    
 		    
 		  

Auction rate securities

   $ —   $ —   $ 5,681   $ 5,681  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ —   $ —   $ 5,681   $ 5,681  

                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 254,237   $ 412,766   $ 5,681   $ 672,684  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

 
 
   Fair Value Measurements
at December 31, 2016 Using		    
  
Description
  Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		   Significant Other
Observable
Inputs
(Level 2)		   Significant
Unobservable
Inputs
(Level 3)		   Total  

Assets:

                          

Cash equivalents:

                          

Money market funds

   $ 69,432   $ —   $ —   $ 69,432  

Corporate debt securities

     —     7,153     —     7,153  

Government debt securities

     —     3,904     —     3,904  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash equivalents

   $ 69,432   $ 11,057   $ —   $ 80,489  

Short-term investments:

    
 		    
 		    
 		    
 		  

Government debt securities

   $ 12,416   $ 97,103   $ —   $ 109,519  

Corporate debt securities

     —     44,442     —     44,442  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total short-term investments

   $ 12,416   $ 141,545   $ —   $ 153,961  

Other assets, net:

    
 		    
 		    
 		    
 		  

Auction rate securities

   $ —   $ —   $ 5,196   $ 5,196  

Derivative instruments

     —     1,808     —     1,808  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ —   $ 1,808   $ 5,196   $ 7,004  

                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 81,848   $ 154,410   $ 5,196   $ 241,454  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

                                                                                                                                                                                                                                
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 December 30, 2017 (in thousands):

 
   Cost   Fair Value  

Due in one year or less

   $ 393,600   $ 393,201  

Due after one year through ten years

     198,981     197,922  

Due after ten years

     81,884     81,561  
​ ​ ​ ​ ​ ​ ​ ​

  $ 674,465   $ 672,684  
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​

                                                                                                                                                                                                                                
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 December 30, 2017
  Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		  

Government debt securities

   $ 244,880   $ (931 ) $ 3,027   $ (15 ) $ 247,907   $ (946 )

Corporate debt securities

     151,149     (447 )   11,578     (73 )   162,727     (520 )

Auction rate securities

     —     —     5,681     (319 )   5,681     (319 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

  $ 396,029   $ (1,378 ) $ 20,286   $ (407 ) $ 416,315   $ (1,785 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

 
   Less Than 12 Months   12 Months or Greater   Total  
As of December 31, 2016
  Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		  

Government debt securities

   $ 79,743   $ (156 ) $ —   $ —   $ 79,743   $ (156 )

Corporate debt securities

     21,737     (132 )   —     —     21,737     (132 )

Auction rate securities

     —     —     5,196     (804 )   5,196     (804 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

  $ 101,480   $ (288 ) $ 5,196   $ (804 ) $ 106,676   $ (1,092 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

                                                                                                                                                                                                                                
Summary of quantitative information about level 3 asset fair value measurements

        The following summarizes quantitative information about Level 3 fair value measurements.

Auction rate securities

Fair Value at
December 30, 2017
(000s)
  Valuation Technique   Unobservable Input   Weighted
Average
$5,681   Discounted cash flow   Estimated yield   1.74%

 
 
 
 
Expected holding period
 
10 years

 
 
 
 
Estimated discount rate
 
3.37%

                                                                                                                                                                                                                                
Summary of activity in Level 3 financial instruments

        The following summarizes the activity in Level 3 financial instruments for the years ended December 30, 2017 and December 31, 2016 (in thousands):

Assets

 
   Year Ended  
Auction Rate Securities
  December 30,
2017		   December 31,
2016		  

Beginning balance

   $ 5,196   $ 7,126  

Settlements

     —     (2,000 )

Gain included in other comprehensive income (loss)

     485     70  
​ ​ ​ ​ ​ ​ ​ ​

Ending balance

   $ 5,681   $ 5,196  
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​

Liabilities

 
   Year Ended  
Contingent Consideration (1)
  December 30,
2017		   December 31,
2016		  

Beginning balance

   $ —   $ 14,073  

Issues

     3,829     —  

Settlements (2)

     —     (11,375 )

Reclassification to acquisition-related liabilities (3)

     (3,380 )   —  

Gain recognized in earnings (4)

     (449 )   (2,698 )
​ ​ ​ ​ ​ ​ ​ ​

Ending balance

   $ —   $ —  
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
(1)
In connection with the acquisitions of Zentri and Energy Micro, the Company recorded contingent consideration based upon the expected achievement of certain milestone goals. Changes to the fair value of contingent consideration due to changes in assumptions used in preparing the valuation models were recorded in selling, general and administrative expenses in the Consolidated Statement of Income.

(2)
On March 11, 2016, the Company entered into an agreement which settled the total amount of contingent consideration related to the Energy Micro acquisition (including all amounts for fiscal 2015 through 2018). See Note 8, Acquisitions, for additional information.

(3)
The milestone goal related to the Zentri contingent consideration was based on fiscal 2017 revenue from certain Zentri products, which is now completed. The accrued consideration is recorded in other current liabilities in the Consolidated Balance Sheet.

(4)
The gain recognized in earnings in fiscal 2016 was due to the settlement of the Energy Micro contingent consideration. This gain was offset in part by a charge of approximately $2.7 million recorded in fiscal 2016 for a portion of the contingent consideration accounted for as post-combination compensation expense.