Investments and Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Mar. 29, 2014	Jun. 29, 2013
Maximum
Foreign Currency Forward Contracts
Foreign currency forward contracts, expiration period	120 days	120 days
Level 3
Fair Value Measurements
Total assets	$ 0	$ 0
Recurring basis | Cash and cash equivalents
Fair Value Measurements
Total assets	205.0
Recurring basis | Short-term investments
Fair Value Measurements
Total assets	580.3
Recurring basis | Restricted cash
Fair Value Measurements
Total assets	30.9
Recurring basis | Other non-current assets
Fair Value Measurements
Total assets	4.6
Recurring basis | Total fair value
Fair Value Measurements
Total debt available-for-sale securities	630.8
Money market funds	186.2
Trading securities	3.8
Total assets	820.8
Recurring basis | Total fair value | U.S. treasuries
Fair Value Measurements
Total debt available-for-sale securities	51.1
Recurring basis | Total fair value | U.S. agencies
Fair Value Measurements
Total debt available-for-sale securities	72.9
Recurring basis | Total fair value | Municipal bonds and sovereign debt instruments
Fair Value Measurements
Total debt available-for-sale securities	16.8
Recurring basis | Total fair value | Asset-backed securities
Fair Value Measurements
Total debt available-for-sale securities	104.4
Recurring basis | Total fair value | Corporate securities
Fair Value Measurements
Total debt available-for-sale securities	385.6
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Measurements
Total debt available-for-sale securities	51.1
Money market funds	186.2
Trading securities	3.8
Total assets	241.1
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries
Fair Value Measurements
Total debt available-for-sale securities	51.1
Recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value Measurements
Total debt available-for-sale securities	579.7
Total assets	579.7
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. agencies
Fair Value Measurements
Total debt available-for-sale securities	72.9
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	104.4
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Fair Value Measurements
Total debt available-for-sale securities	$ 385.6