Investments and Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Maximum
Foreign Currency Forward Contracts
Foreign currency forward contracts, expiration period	120 days	120 days
Recurring basis
Fair Value Measurements
Total debt available-for-sale securities	$ 588.9
Money market funds	178.7
Trading securities	3.9
Total assets	771.5
Recurring basis | Cash and cash equivalents
Fair Value Measurements
Total assets	183.2
Recurring basis | Short-term investments
Fair Value Measurements
Total assets	552.2
Recurring basis | Restricted cash
Fair Value Measurements
Total assets	31.5
Recurring basis | Other non-current assets
Fair Value Measurements
Total assets	4.6
Recurring basis | U.S. treasuries
Fair Value Measurements
Total debt available-for-sale securities	36.8
Recurring basis | U.S. agencies
Fair Value Measurements
Total debt available-for-sale securities	70.0
Recurring basis | Municipal bonds and sovereign debt instruments
Fair Value Measurements
Total debt available-for-sale securities	16.8
Recurring basis | Asset-backed securities
Fair Value Measurements
Total debt available-for-sale securities	94.6
Recurring basis | Corporate securities
Fair Value Measurements
Total debt available-for-sale securities	370.7
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Measurements
Total debt available-for-sale securities	36.8
Money market funds	178.7
Trading securities	3.9
Total assets	219.4
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries
Fair Value Measurements
Total debt available-for-sale securities	36.8
Recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value Measurements
Total debt available-for-sale securities	552.1
Total assets	552.1
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. agencies
Fair Value Measurements
Total debt available-for-sale securities	70.0
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds and sovereign debt instruments
Fair Value Measurements
Total debt available-for-sale securities	16.8
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Fair Value Measurements
Total debt available-for-sale securities	94.6
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Fair Value Measurements
Total debt available-for-sale securities	$ 370.7