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Investments, Forward Contracts and Fair Value Measurements - Measured at Fair Value (Details) - USD ($) $ in Millions | Dec. 29, 2018 | Jun. 30, 2018
--- | --- | ---
Debt available-for-sale securities |  |
Total debt available-for-sale securities | $ 29.1 | $ 189.6
Money market funds | 226.8 | 354.9
Trading securities | 1.5 | 1.6
Foreign currency forward contract (1) | 1.0 | 2.7
Total assets | 258.4 | 548.8
Liability: |  |
Foreign currency forward contract (3) | 5.6 | 11.7
Contingent consideration | 36.2 | 0.0
Total liabilities | 41.8 | 11.7
Prepayments and other current assets |  |
Debt available-for-sale securities |  |
Total assets | 1.0 |
Other current assets |  |
Debt available-for-sale securities |  |
Total assets |  | 2.7
Cash and cash equivalents |  |
Debt available-for-sale securities |  |
Total assets | 215.8 | 364.8
Short-term investments |  |
Debt available-for-sale securities |  |
Total assets | 30.0 | 169.3
Restricted cash |  |
Debt available-for-sale securities |  |
Total assets | 7.1 | 7.3
Other non-current assets |  |
Debt available-for-sale securities |  |
Total assets | 4.5 | 4.7
Other current liabilities |  |
Liability: |  |
Total liabilities | 5.6 | 11.7
U.S. treasuries |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 4.0 | 35.9
Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 3.5 | 13.2
Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 1.7 | 2.7
Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 4.0 | 23.5
Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 15.9 | 114.3
Level 1 |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 4.0 | 35.9
Money market funds | 226.8 | 354.9
Trading securities | 1.5 | 1.6
Foreign currency forward contract (1) | 0.0 | 0.0
Total assets | 232.3 | 392.4
Liability: |  |
Foreign currency forward contract (3) | 0.0 | 0.0
Contingent consideration | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
Level 1 | U.S. treasuries |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 4.0 | 35.9
Level 1 | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Level 1 | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Level 1 | Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Level 1 | Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Level 2 |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 25.1 | 153.7
Money market funds | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Foreign currency forward contract (1) | 1.0 | 2.7
Total assets | 26.1 | 156.4
Liability: |  |
Foreign currency forward contract (3) | 5.6 | 11.7
Contingent consideration | 0.0 | 0.0
Total liabilities | 5.6 | 11.7
Level 2 | U.S. treasuries |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Level 2 | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 3.5 | 13.2
Level 2 | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 1.7 | 2.7
Level 2 | Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 4.0 | 23.5
Level 2 | Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 15.9 | 114.3
Level 3 Investments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Money market funds | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Foreign currency forward contract (1) | 0.0 | 0.0
Total assets | 0.0 | 0.0
Liability: |  |
Foreign currency forward contract (3) | 0.0 | 0.0
Contingent consideration | 36.2 | 0.0
Total liabilities | 36.2 | 0.0
Level 3 Investments | U.S. treasuries |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Level 3 Investments | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Level 3 Investments | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Level 3 Investments | Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Level 3 Investments | Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | $ 0.0 | $ 0.0

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