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Investments and Fair Value Measurements - Additional Information (Details) - USD ($) shares in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 02, 2016 | Jul. 01, 2017 | Jul. 02, 2016 | Jun. 27, 2015 | Aug. 01, 2015
Investments |  |  |  |  |
Available-for-sale Securities | $ 519.1 | $ 509.1 | $ 519.1 |  |
Other-than-temporary impairment loss |  | 0.0 | 0.0 | $ 0.0 |
Not designated | Foreign exchange forward contracts |  |  |  |  |
Investments |  |  |  |  |
Derivative asset, fair value |  | 7.3 |  |  |
Derivative liability, fair value |  | 1.3 |  |  |
Gains (losses) on derivatives |  | 3.3 | (9.6) |  |
Not designated | Foreign exchange forward contracts | Held to purchase |  |  |  |  |
Investments |  |  |  |  |
Notional amount of forward contracts | 110.0 | 134.3 | 110.0 |  |
Not designated | Foreign exchange forward contracts | Held to sell |  |  |  |  |
Investments |  |  |  |  |
Notional amount of forward contracts | 55.2 | 25.4 | 55.2 |  |
Cash equivalents |  |  |  |  |
Investments |  |  |  |  |
Available-for-sale Securities | 36.1 | 78.2 | 36.1 |  |
Short-term investments |  |  |  |  |
Investments |  |  |  |  |
Available-for-sale Securities | 311.1 | 430.2 | 311.1 |  |
Other non-current assets |  |  |  |  |
Investments |  |  |  |  |
Available-for-sale Securities | 0.6 | 0.7 | 0.6 |  |
Trading securities | Short-term investments |  |  |  |  |
Investments |  |  |  |  |
Deferred compensation plan assets | 2.4 | 2.0 | 2.4 |  |
Trading securities | Short-term investments | Total debt securities |  |  |  |  |
Investments |  |  |  |  |
Deferred compensation plan assets | 0.3 | 0.5 | 0.3 |  |
Trading securities | Short-term investments | Money market instruments and funds |  |  |  |  |
Investments |  |  |  |  |
Deferred compensation plan assets | 0.8 | 0.3 | 0.8 |  |
Trading securities | Short-term investments | Marketable equity securities |  |  |  |  |
Investments |  |  |  |  |
Deferred compensation plan assets | 1.3 | 1.2 | 1.3 |  |
Lumentum |  |  |  |  |
Investments |  |  |  |  |
Shares held in investment (in shares) |  |  |  |  | 11.7
Marketable equity securities |  |  |  |  |
Investments |  |  |  |  |
Available-for-sale Securities | $ 171.3 |  | 171.3 |  |
Number of equity securities sold (in shares) | 4.5 |  |  |  |
Gross realized gain (loss) | $ 71.5 | 203.0 | 71.5 |  |
Income tax effect on gross realized gain (loss) | 2.0 | $ 0.0 |  |  |
Marketable equity securities | Short-term investments |  |  |  |  |
Investments |  |  |  |  |
Available-for-sale Securities | $ 171.3 |  | $ 171.3 |  |
Marketable equity securities | Lumentum |  |  |  |  |
Investments |  |  |  |  |
Shares held in investment (in shares) | 7.2 |  | 7.2 |  |
Number of equity securities sold (in shares) |  | 7.2 |  |  |

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