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Investments and Fair Value Measurements (Tables)
 12 Months Ended
Jun. 28, 2014
Investments and Fair Value Measurements  
Schedule of available-for-sale securities

As of June 28, 2014 the Company's available-for-sale securities were as follows (in millions):

 
   Amortized
Cost / Carrying
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Estimated
Fair Value		  

Debt securities:

                          

U.S. treasuries

   $ 36.8   $ —   $ —   $ 36.8  

U.S. agencies

     70.0     —     —     70.0  

Municipal bonds and sovereign debt instruments

     16.8     —     —     16.8  

Asset-backed securities

     94.7     0.1     (0.2 )   94.6  

Corporate securities

     370.5     0.2     —     370.7  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total debt available-for-sale securities

   $ 588.8   $ 0.3   $ (0.2 ) $ 588.9  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

As of June 29, 2013, the Company's available-for-sale securities were as follows (in millions):

 
   Amortized
Cost / Carrying
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Estimated
Fair Value		  

Debt securities:

                          

U.S. treasuries

   $ 12.0   $ —   $ —   $ 12.0  

U.S. agencies

     52.4     —     —     52.4  

Municipal bonds and sovereign debt instruments

     12.7     —     —     12.7  

Asset-backed securities

     15.5     —     (0.3 )   15.2  

Corporate securities

     135.1     0.7     (0.1 )   135.7  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total debt available-for-sale securities

   $ 227.7   $ 0.7   $ (0.4 ) $ 228.0  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of gross unrealized losses on available-for-sale securities

As of June 28, 2014, the Company's total gross unrealized losses on available-for-sale securities, aggregated by type of investment instrument, were as follows (in millions):

 
   Less than
12 Months		   Greater than
12 Months		   Total  

Asset-backed securities

   $ —   $ 0.2   $ 0.2  

Corporate securities

     —     —     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total gross unrealized losses

   $ —   $ 0.2   $ 0.2  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

As of June 29, 2013, the Company's total gross unrealized losses on available-for-sale securities, aggregated by type of investment instrument, were as follows (in millions):

 
   Less than
12 Months		   Greater than
12 Months		   Total  

Asset-backed securities

   $ —   $ 0.3   $ 0.3  

Corporate securities

     0.1     —     0.1  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total gross unrealized losses

   $ 0.1   $ 0.3   $ 0.4  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Schedule of contractual maturities of available-for-sale securities

As of June 28, 2014, contractual maturities of the Company's debt securities classified as available-for-sale securities were as follows (in millions):

 
   Amortized
Cost / Carrying
Cost		   Estimated
Fair Value		  

Amounts maturing in less than 1 year

   $ 412.5   $ 412.6  

Amounts maturing in 1 - 5 years

     175.3     175.5  

Amounts maturing more than 5 years

     1.0     0.8  
           
​ ​ ​ ​ ​ ​ ​ ​

Total debt available-for-sale securities

   $ 588.8   $ 588.9  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of assets measured at fair value

Assets measured at fair value at June 28, 2014 are summarized below (in millions):

 
    
   Fair value measurement as of
June 28, 2014		  
 
   Total   Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		   Significant
Other
Observable
Inputs
(Level 2)		  

Assets:

                    

Debt available-for-sale securities

                    

U.S. treasuries

   $ 36.8   $ 36.8   $ —  

U.S. agencies

     70.0     —     70.0  

Municipal bonds and sovereign debt instruments

     16.8     —     16.8  

Asset-backed securities

     94.6     —     94.6  

Corporate securities

     370.7     —     370.7  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total debt available-for-sale securities

     588.9     36.8     552.1  

Money market funds

     178.7     178.7     —  

Trading securities

     3.9     3.9     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total assets(1)

   $ 771.5   $ 219.4   $ 552.1  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
(1)
$183.2 million in cash and cash equivalents, $552.2 million in short-term investments, $31.5 million in restricted cash, and $4.6 million in other non-current assets on the Company's consolidated balance sheets.