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Investments, Forward Contracts and Fair Value Measurements - Measured at Fair Value (Details) - USD ($) $ in Millions | Sep. 29, 2018 | Jun. 30, 2018
--- | --- | ---
Debt available-for-sale securities |  |
Total debt available-for-sale securities | $ 50.7 | $ 189.6
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 | 8.7 | 13.2
Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 2.7 | 2.7
Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 6.7 | 23.5
Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 28.6 | 114.3
Recurring basis |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 50.7 | 189.6
Money market funds | 329.1 | 354.9
Trading securities | 1.6 | 1.6
Foreign currency forward contracts | 1.9 | 2.7
Total assets | 383.3 | 548.8
Liability: |  |
Foreign currency forward contracts | 3.2 | 11.7
Total liabilities | 3.2 | 11.7
Recurring basis | Cash and cash equivalents |  |
Debt available-for-sale securities |  |
Total assets | 318.0 | 364.8
Recurring basis | Short-term investments |  |
Debt available-for-sale securities |  |
Total assets | 51.7 | 169.3
Recurring basis | Restricted cash |  |
Debt available-for-sale securities |  |
Total assets | 7.1 | 7.3
Recurring basis | Prepayments and other current assets |  |
Debt available-for-sale securities |  |
Total assets | 1.9 |
Recurring basis | Other current assets |  |
Debt available-for-sale securities |  |
Total assets |  | 2.7
Recurring basis | Other non-current assets |  |
Debt available-for-sale securities |  |
Total assets | 4.6 | 4.7
Recurring basis | Other current liabilities |  |
Liability: |  |
Total liabilities | 3.2 | 11.7
Recurring basis | U.S. treasuries |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 4.0 | 35.9
Recurring basis | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 8.7 | 13.2
Recurring basis | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 2.7 | 2.7
Recurring basis | Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 6.7 | 23.5
Recurring basis | Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 28.6 | 114.3
Recurring basis | Level 1 Investments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 4.0 | 35.9
Money market funds | 329.1 | 354.9
Trading securities | 1.6 | 1.6
Foreign currency forward contracts | 0.0 | 0.0
Total assets | 334.7 | 392.4
Liability: |  |
Foreign currency forward contracts | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
Recurring basis | Level 1 Investments | U.S. treasuries |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 4.0 | 35.9
Recurring basis | Level 1 Investments | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Level 1 Investments | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Level 1 Investments | Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Level 1 Investments | Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Level 2 Investments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 46.7 | 153.7
Money market funds | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Foreign currency forward contracts | 1.9 | 2.7
Total assets | 48.6 | 156.4
Liability: |  |
Foreign currency forward contracts | 3.2 | 11.7
Total liabilities | 3.2 | 11.7
Recurring basis | Level 2 Investments | U.S. treasuries |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Level 2 Investments | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 8.7 | 13.2
Recurring basis | Level 2 Investments | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 2.7 | 2.7
Recurring basis | Level 2 Investments | Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 6.7 | 23.5
Recurring basis | Level 2 Investments | Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | $ 28.6 | $ 114.3

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