Investments and Fair Value Measurements (Details 2) (USD $)	Mar. 31, 2012	Jul. 02, 2011
Foreign Currency Forward Contracts
Foreign currency forward contracts, expiration period (in days)	120 days
Fair value of foreign currency forward contract	$ 0	$ 0
Short-term investments
Fair Value Measurements
Trading securities	4,700,000	5,700,000
Recurring basis | Cash and cash equivalents
Fair Value Measurements
Total assets	355,300,000
Recurring basis | Short-term investments
Fair Value Measurements
Total assets	303,200,000
Recurring basis | Restricted cash
Fair Value Measurements
Total assets	32,600,000
Recurring basis | Other non-current assets
Fair Value Measurements
Total assets	6,600,000
Recurring basis | Long-term investments
Fair Value Measurements
Total assets	1,300,000
Recurring basis | Total fair value
Fair Value Measurements
Total debt available-for-sale securities	332,700,000
Money market instruments and funds	361,600,000
Trading securities	4,700,000
Total assets	699,000,000
Recurring basis | Total fair value | U.S. treasuries
Fair Value Measurements
Total debt available-for-sale securities	38,500,000
Recurring basis | Total fair value | U.S. Agencies
Fair Value Measurements
Total debt available-for-sale securities	64,200,000
Recurring basis | Total fair value | Foreign Agencies
Fair Value Measurements
Total debt available-for-sale securities	2,000,000
Recurring basis | Total fair value | Municipal bonds & sovereign debt instruments
Fair Value Measurements
Total debt available-for-sale securities	13,600,000
Recurring basis | Total fair value | Asset-backed securities
Fair Value Measurements
Total debt available-for-sale securities	28,500,000
Recurring basis | Total fair value | Corporate securities
Fair Value Measurements
Total debt available-for-sale securities	185,900,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Measurements
Total debt available-for-sale securities	38,500,000
Money market instruments and funds	361,600,000
Trading securities	4,700,000
Total assets	404,800,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries
Fair Value Measurements
Total debt available-for-sale securities	38,500,000
Recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value Measurements
Total debt available-for-sale securities	294,200,000
Total assets	294,200,000
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Agencies
Fair Value Measurements
Total debt available-for-sale securities	64,200,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Foreign Agencies
Fair Value Measurements
Total debt available-for-sale securities	2,000,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds & sovereign debt instruments
Fair Value Measurements
Total debt available-for-sale securities	13,600,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Fair Value Measurements
Total debt available-for-sale securities	28,500,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Fair Value Measurements
Total debt available-for-sale securities	$ 185,900,000