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Investments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring basis - USD ($) $ in Millions | Jul. 01, 2017 | Jul. 02, 2016
--- | --- | ---
Cash and cash equivalents |  |
Assets: |  |
Total assets | $ 789.2 | $ 295.4
Short-term investments |  |
Assets: |  |
Total assets | 432.2 | 484.7
Restricted cash |  |
Assets: |  |
Total assets | 11.0 | 11.3
Other current assets |  |
Assets: |  |
Total assets | 7.3 |
Other non-current assets |  |
Assets: |  |
Total assets | 5.1 | 4.5
Other current liabilities |  |
Liability: |  |
Total liabilities | 1.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Total debt available-for-sale securities | 56.7 | 46.1
Marketable equity securities | 0.0 | 171.3
Money market funds | 726.4 | 274.4
Trading securities | 2.0 | 2.4
Foreign currency forward contracts | 0.0 |
Total assets | 785.1 | 494.2
Liability: |  |
Foreign currency forward contracts | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries |  |
Assets: |  |
Total debt available-for-sale securities | 56.7 | 46.1
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. agencies |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 | 0.0
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
Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 |
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total debt available-for-sale securities | 452.4 | 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 | 7.3 |
Total assets | 459.7 | 301.7
Liability: |  |
Foreign currency forward contracts | 1.3 | 0.0
Total liabilities | 1.3 | 0.0
Significant Other Observable Inputs (Level 2) | U.S. treasuries |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) | U.S. agencies |  |
Assets: |  |
Total debt available-for-sale securities | 44.9 | 24.9
Significant Other Observable Inputs (Level 2) | Municipal bonds and sovereign debt instruments |  |
Assets: |  |
Total debt available-for-sale securities | 4.4 | 2.0
Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Assets: |  |
Total debt available-for-sale securities | 71.1 | 50.2
Significant Other Observable Inputs (Level 2) | Corporate securities |  |
Assets: |  |
Total debt available-for-sale securities | 326.0 | 224.6
Significant Other Observable Inputs (Level 2) | Certificates of deposit |  |
Assets: |  |
Total debt available-for-sale securities | 6.0 |
Total fair value |  |
Assets: |  |
Total debt available-for-sale securities | 509.1 | 347.8
Marketable equity securities | 0.0 | 171.3
Money market funds | 726.4 | 274.4
Trading securities | 2.0 | 2.4
Foreign currency forward contracts | 7.3 | 0.0
Total assets | 1,244.8 | 795.9
Liability: |  |
Foreign currency forward contracts | 1.3 | 0.0
Total liabilities | 1.3 | 0.0
Total fair value | U.S. treasuries |  |
Assets: |  |
Total debt available-for-sale securities | 56.7 | 46.1
Total fair value | U.S. agencies |  |
Assets: |  |
Total debt available-for-sale securities | 44.9 | 24.9
Total fair value | Municipal bonds and sovereign debt instruments |  |
Assets: |  |
Total debt available-for-sale securities | 4.4 | 2.0
Total fair value | Asset-backed securities |  |
Assets: |  |
Total debt available-for-sale securities | 71.1 | 50.2
Total fair value | Corporate securities |  |
Assets: |  |
Total debt available-for-sale securities | 326.0 | 224.6
Total fair value | Certificates of deposit |  |
Assets: |  |
Total debt available-for-sale securities | $ 6.0 | $ 0.0

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