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Investments, Forward Contracts and Fair Value Measurements - Additional Information (Details) - USD ($) shares in Millions | 12 Months Ended
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Jun. 30, 2018 | Jul. 01, 2017 | Jul. 02, 2016
Investments |  |  |
Total debt available-for-sale securities | $ 189,600,000 | $ 509,100,000 |
Other-than-temporary impairment charges | 0 | 0 | $ 0
Not designated | Foreign exchange forward contracts |  |  |
Investments |  |  |
Derivative asset, fair value | 2,700,000 |  |
Derivative liability, fair value | 11,700,000 |  |
(Loss) gain on derivatives | $ (800,000) | 3,300,000 |
Not designated | Foreign exchange forward contracts | Held to purchase |  |  |
Investments |  |  |
Derivative term | 120 days |  |
Notional amount of forward contracts | $ 167,500,000 | 134,300,000 |
Not designated | Foreign exchange forward contracts | Held to sell |  |  |
Investments |  |  |
Notional amount of forward contracts | 28,600,000 | 25,400,000 |
Short-term investments |  |  |
Investments |  |  |
Deferred compensation plan assets | 1,600,000 | $ 2,000,000 |
Short-term investments | Debt securities |  |  |
Investments |  |  |
Deferred compensation plan assets | 400,000 |  |
Short-term investments | Money market funds |  |  |
Investments |  |  |
Deferred compensation plan assets | 300,000 |  |
Short-term investments | Marketable equity securities |  |  |
Investments |  |  |
Deferred compensation plan assets | 900,000 |  |
Lumentum |  |  |
Investments |  |  |
Number of equity securities sold (in shares) |  | 7.2 |
Gross gain on sale of investments |  | $ 203,000,000 |
Tax effect on sale |  | 0 |
Cash equivalents |  |  |
Investments |  |  |
Total debt available-for-sale securities | 21,200,000 | 78,200,000 |
Short-term investments |  |  |
Investments |  |  |
Total debt available-for-sale securities | 167,700,000 | 430,200,000 |
Other non-current assets |  |  |
Investments |  |  |
Total debt available-for-sale securities | $ 700,000 | 700,000 |
Money market funds | Short-term investments |  |  |
Investments |  |  |
Deferred compensation plan assets |  | 300,000 |
Marketable equity securities | Short-term investments |  |  |
Investments |  |  |
Deferred compensation plan assets |  | 1,200,000 |
Debt securities | Short-term investments |  |  |
Investments |  |  |
Deferred compensation plan assets |  | $ 500,000 |

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