Investments and Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Mar. 30, 2013	Jun. 30, 2012
Maximum
Foreign Currency Forward Contracts
Foreign currency forward contracts, expiration period	120 days	120 days
Level 3
Fair Value Measurements
Total assets	0
Recurring basis | Cash and cash equivalents
Fair Value Measurements
Total assets	158.0
Recurring basis | Short-term investments
Fair Value Measurements
Total assets	350.4
Recurring basis | Restricted cash
Fair Value Measurements
Total assets	30.7
Recurring basis | Other non-current assets
Fair Value Measurements
Total assets	7.3
Recurring basis | Total fair value
Fair Value Measurements
Total debt available-for-sale securities	368.3
Money market instruments and funds	173.9
Trading securities	4.2
Total assets	546.4
Recurring basis | Total fair value | U.S. treasuries
Fair Value Measurements
Total debt available-for-sale securities	30.6
Recurring basis | Total fair value | U.S. Agencies
Fair Value Measurements
Total debt available-for-sale securities	53.5
Recurring basis | Total fair value | Municipal bonds and sovereign debt instruments
Fair Value Measurements
Total debt available-for-sale securities	10.2
Recurring basis | Total fair value | Asset-backed securities
Fair Value Measurements
Total debt available-for-sale securities	38.7
Recurring basis | Total fair value | U.S. Corporate Securities
Fair Value Measurements
Money market instruments and funds	235.3
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Measurements
Total debt available-for-sale securities	30.6
Money market instruments and funds	173.9
Trading securities	4.2
Total assets	208.7
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries
Fair Value Measurements
Total debt available-for-sale securities	30.6
Recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value Measurements
Total debt available-for-sale securities	337.7
Total assets	337.7
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) | Municipal bonds and sovereign debt instruments
Fair Value Measurements
Total debt available-for-sale securities	10.2
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Fair Value Measurements
Total debt available-for-sale securities	38.7
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Corporate Securities
Fair Value Measurements
Total debt available-for-sale securities	235.3