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Investments and Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Jun. 28, 2014
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost $ 575.1   $ 588.8
Gross Unrealized Gains 0.3   0.3
Gross Unrealized Losses (0.3)   (0.2)
Available for Sale Investments at Fair Value 575.1   588.9
Other-than-temporary impairment loss 0 0  
Contractual maturities of debt securities classified as available-for-sale securities, Amortized cost      
Amortized cost of amounts maturing in less than 1 year 412.0    
Amortized cost of amounts maturing in 1-5 years 162.1    
Amortized cost of amounts maturing in more than 5 years 1.0    
Total amortized cost of debt available-for-sale securities 575.1    
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 412.0    
Estimated fair value amounts maturing in 1 -5 years 162.3    
Estimated fair value amounts maturing in more than 5 years 0.8    
Total estimated fair value of debt available-for-sale securities 575.1    
Term of maturities of securities classified as current assets included in short-term investments 12 months    
Cash equivalents
     
Available-For-Sale Investments      
Available for Sale Investments at Fair Value 40.5   39.8
Short-term investments
     
Available-For-Sale Investments      
Available for Sale Investments at Fair Value 533.8   548.3
Other non-current assets
     
Available-For-Sale Investments      
Available for Sale Investments at Fair Value 0.8   0.8
Asset-backed securities
     
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost 87.3   94.7
Gross Unrealized Gains     0.1
Gross Unrealized Losses (0.2)   (0.2)
Available for Sale Investments at Fair Value 87.1   94.6
U.S. treasuries
     
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost 27.5   36.8
Available for Sale Investments at Fair Value 27.5   36.8
U.S. Agencies
     
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost 87.8   70.0
Gross Unrealized Gains 0.1    
Available for Sale Investments at Fair Value 87.9   70.0
Municipal bonds and sovereign debt instruments
     
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost 15.4   16.8
Available for Sale Investments at Fair Value 15.4   16.8
Corporate securities
     
Available-For-Sale Investments      
Amortized Cost/ Carrying Cost 357.1   370.5
Gross Unrealized Gains 0.2   0.2
Gross Unrealized Losses (0.1)    
Available for Sale Investments at Fair Value $ 357.2   $ 370.7