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Investments and Fair Value Measurements (Details 4) - USD ($)
$ in Millions
Oct. 01, 2016
Jul. 02, 2016
Cash and cash equivalents    
Assets:    
Total assets   $ 295.4
Short-term investments    
Assets:    
Total assets   484.7
Restricted cash    
Assets:    
Total assets   11.3
Other non-current assets    
Assets:    
Total assets   4.5
Other current liabilities    
Liability:    
Total liabilities $ 1.5  
Recurring basis | Cash and cash equivalents    
Assets:    
Total assets 287.5  
Recurring basis | Short-term investments    
Assets:    
Total assets 558.8  
Recurring basis | Restricted cash    
Assets:    
Total assets 10.9  
Recurring basis | Other non-current assets    
Assets:    
Total assets 4.9  
Recurring basis | Prepayments and other current assets    
Assets:    
Total assets 1.8  
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total debt available-for-sale securities 54.1 46.1
Marketable equity securities 141.1 171.3
Money market funds 278.7 274.4
Trading securities 2.5 2.4
Foreign currency forward contracts 0.0 0.0
Total assets 476.4 494.2
Liability:    
Foreign currency forward contracts 0.0 0.0
Total liabilities 0.0 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries    
Assets:    
Total debt available-for-sale securities 54.1 46.1
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. agencies    
Assets:    
Total debt available-for-sale securities 0.0 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds and sovereign debt instruments    
Assets:    
Total debt available-for-sale securities 0.0 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities    
Assets:    
Total debt available-for-sale securities 0.0 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities    
Assets:    
Total debt available-for-sale securities 0.0 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposits    
Assets:    
Total debt available-for-sale securities 0.0 0.0
Recurring basis | Significant Other Observable Inputs (Level 2)    
Assets:    
Total debt available-for-sale securities 385.7 301.7
Marketable equity securities 0.0 0.0
Money market funds 0.0 0.0
Trading securities 0.0 0.0
Foreign currency forward contracts 1.8 0.0
Total assets 387.5 301.7
Liability:    
Foreign currency forward contracts 1.5 0.0
Total liabilities 1.5 0.0
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. treasuries    
Assets:    
Total debt available-for-sale securities 0.0 0.0
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. agencies    
Assets:    
Total debt available-for-sale securities 37.6 24.9
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds and sovereign debt instruments    
Assets:    
Total debt available-for-sale securities 4.8 2.0
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Assets:    
Total debt available-for-sale securities 60.9 50.2
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities    
Assets:    
Total debt available-for-sale securities 276.3 224.6
Recurring basis | Significant Other Observable Inputs (Level 2) | Certificates of deposits    
Assets:    
Total debt available-for-sale securities 6.1 0.0
Recurring basis | Total fair value    
Assets:    
Total debt available-for-sale securities 439.8 347.8
Marketable equity securities 141.1 171.3
Money market funds 278.7 274.4
Trading securities 2.5 2.4
Foreign currency forward contracts 1.8 0.0
Total assets 863.9 795.9
Liability:    
Foreign currency forward contracts 1.5 0.0
Total liabilities 1.5 0.0
Recurring basis | Total fair value | U.S. treasuries    
Assets:    
Total debt available-for-sale securities 54.1 46.1
Recurring basis | Total fair value | U.S. agencies    
Assets:    
Total debt available-for-sale securities 37.6 24.9
Recurring basis | Total fair value | Municipal bonds and sovereign debt instruments    
Assets:    
Total debt available-for-sale securities 4.8 2.0
Recurring basis | Total fair value | Asset-backed securities    
Assets:    
Total debt available-for-sale securities 60.9 50.2
Recurring basis | Total fair value | Corporate securities    
Assets:    
Total debt available-for-sale securities 276.3 224.6
Recurring basis | Total fair value | Certificates of deposits    
Assets:    
Total debt available-for-sale securities $ 6.1 $ 0.0