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Investments and Fair Value Measurements (Details 3) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Dec. 29, 2012
Jun. 30, 2012
Maximum
   
Foreign Currency Forward Contracts    
Foreign currency forward contracts, expiration period 120 days 120 days
Recurring basis | Cash and cash equivalents
   
Fair Value Measurements    
Total assets 210.1  
Recurring basis | Short-term investments
   
Fair Value Measurements    
Total assets 403.8  
Recurring basis | Restricted cash
   
Fair Value Measurements    
Total assets 30.9  
Recurring basis | Other non-current assets
   
Fair Value Measurements    
Total assets 7.9  
Recurring basis | Total fair value
   
Fair Value Measurements    
Total debt available-for-sale securities 426.9  
Money market instruments and funds 220.9  
Trading securities 4.9  
Total assets 652.7  
Recurring basis | Total fair value | U.S. treasuries
   
Fair Value Measurements    
Total debt available-for-sale securities 71.9  
Recurring basis | Total fair value | U.S. Agencies
   
Fair Value Measurements    
Total debt available-for-sale securities 53.5  
Recurring basis | Total fair value | Foreign Agencies
   
Fair Value Measurements    
Total debt available-for-sale securities 4.1  
Recurring basis | Total fair value | Municipal bonds and sovereign debt instruments
   
Fair Value Measurements    
Total debt available-for-sale securities 6.6  
Recurring basis | Total fair value | Asset-backed securities
   
Fair Value Measurements    
Total debt available-for-sale securities 40.1  
Recurring basis | Total fair value | U.S. Corporate Securities
   
Fair Value Measurements    
Money market instruments and funds 215.1  
Recurring basis | Total fair value | Foreign Corporate Securities
   
Fair Value Measurements    
Money market instruments and funds 35.6  
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Fair Value Measurements    
Total debt available-for-sale securities 71.9  
Money market instruments and funds 220.9  
Trading securities 4.9  
Total assets 297.7  
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries
   
Fair Value Measurements    
Total debt available-for-sale securities 71.9  
Recurring basis | Significant Other Observable Inputs (Level 2)
   
Fair Value Measurements    
Total debt available-for-sale securities 355.0  
Total assets 355.0  
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Agencies
   
Fair Value Measurements    
Total debt available-for-sale securities 53.5  
Recurring basis | Significant Other Observable Inputs (Level 2) | Foreign Agencies
   
Fair Value Measurements    
Total debt available-for-sale securities 4.1  
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds and sovereign debt instruments
   
Fair Value Measurements    
Total debt available-for-sale securities 6.6  
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities
   
Fair Value Measurements    
Total debt available-for-sale securities 40.1  
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Corporate Securities
   
Fair Value Measurements    
Total debt available-for-sale securities 215.1  
Recurring basis | Significant Other Observable Inputs (Level 2) | Foreign Corporate Securities
   
Fair Value Measurements    
Total debt available-for-sale securities 35.6