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Investments and Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Jun. 29, 2013
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost $ 687.7   $ 227.7
Gross Unrealized Gains 0.4   0.7
Gross Unrealized Losses (0.4)   (0.4)
Available for Sale Investments at Fair Value 687.7   228.0
Other-than-temporary impairment loss 0 0  
Gross unrealized losses on available-for-sale securities      
Gross unrealized losses, Less than 12 Months 0.1   0.1
Gross unrealized losses, Greater than 12 Months 0.3   0.3
Total gross unrealized losses 0.4   0.4
Cash equivalents
     
Available-For-Sale Investments      
Available for Sale Investments at Fair Value 83.6   26.2
Short-term investments
     
Available-For-Sale Investments      
Available for Sale Investments at Fair Value 603.3   201.0
Other non-current assets
     
Available-For-Sale Investments      
Available for Sale Investments at Fair Value 0.8   0.8
Debt securities
     
Contractual maturities of debt securities classified as available-for-sale securities, Amortized cost      
Amortized cost of amounts maturing in less than 1 year 479.0    
Amortized cost of amounts maturing in 1-5 years 207.7    
Amortized cost of amounts maturing in more than 5 years 1.0    
Total amortized cost of debt available-for-sale securities 687.7    
Contractual maturities of the debt securities classified as available-for-sale securities, Estimated fair value      
Estimated fair value amounts maturing in less than 1 year 479.0    
Estimated fair value amounts maturing in 1 -5 years 207.9    
Estimated fair value amounts maturing in more than 5 years 0.8    
Total estimated fair value of debt available-for-sale securities 687.7    
Asset-backed securities
     
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost 40.9   15.5
Gross Unrealized Losses (0.3)   (0.3)
Available for Sale Investments at Fair Value 40.6   15.2
Gross unrealized losses on available-for-sale securities      
Gross unrealized losses, Greater than 12 Months 0.3   0.3
Total gross unrealized losses 0.3   0.3
U.S. treasuries
     
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost 50.5   12.0
Available for Sale Investments at Fair Value 50.5   12.0
U.S. Agencies
     
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost 119.3   52.4
Gross Unrealized Gains 0.1    
Available for Sale Investments at Fair Value 119.4   52.4
Municipal bonds and sovereign debt instruments
     
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost 20.9   12.7
Available for Sale Investments at Fair Value 20.9   12.7
Corporate securities
     
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost 456.1   135.1
Gross Unrealized Gains 0.3   0.7
Gross Unrealized Losses (0.1)   (0.1)
Available for Sale Investments at Fair Value 456.3   135.7
Gross unrealized losses on available-for-sale securities      
Gross unrealized losses, Less than 12 Months 0.1   0.1
Total gross unrealized losses $ 0.1   $ 0.1