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Investments and Fair Value Measurements - Amortized Cost to Fair Value Reconciliation (Details) - USD ($) $ in Millions | Jul. 01, 2017 | Jul. 02, 2016
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Available-For-Sale Investments |  |
Amortized Cost/ Carrying Cost | $ 509.8 | $ 410.0
Gross Unrealized Gains | 0.1 | 109.5
Gross Unrealized Losses | (0.8) | (0.4)
Available-for-sale Securities | 509.1 | 519.1
Total debt securities |  |
Available-For-Sale Investments |  |
Amortized Cost/ Carrying Cost |  | 347.9
Gross Unrealized Gains |  | 0.3
Gross Unrealized Losses |  | (0.4)
Available-for-sale Securities |  | 347.8
U.S. treasuries |  |
Available-For-Sale Investments |  |
Amortized Cost/ Carrying Cost | 56.8 | 46.1
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.1) | 0.0
Available-for-sale Securities | 56.7 | 46.1
U.S. agencies |  |
Available-For-Sale Investments |  |
Amortized Cost/ Carrying Cost | 45.0 | 24.9
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.1) | 0.0
Available-for-sale Securities | 44.9 | 24.9
Municipal bonds and sovereign debt instruments |  |
Available-For-Sale Investments |  |
Amortized Cost/ Carrying Cost | 4.4 | 2.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Available-for-sale Securities | 4.4 | 2.0
Asset-backed securities |  |
Available-For-Sale Investments |  |
Amortized Cost/ Carrying Cost | 71.5 | 50.4
Gross Unrealized Gains | 0.0 | 0.1
Gross Unrealized Losses | (0.4) | (0.3)
Available-for-sale Securities | 71.1 | 50.2
Corporate securities |  |
Available-For-Sale Investments |  |
Amortized Cost/ Carrying Cost | 326.1 | 224.5
Gross Unrealized Gains | 0.1 | 0.2
Gross Unrealized Losses | (0.2) | (0.1)
Available-for-sale Securities | 326.0 | 224.6
Certificates of deposit |  |
Available-For-Sale Investments |  |
Amortized Cost/ Carrying Cost | 6.0 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses | 0.0 |
Available-for-sale Securities | $ 6.0 |
Marketable equity securities |  |
Available-For-Sale Investments |  |
Amortized Cost/ Carrying Cost |  | 62.1
Gross Unrealized Gains |  | 109.2
Gross Unrealized Losses |  | 0.0
Available-for-sale Securities |  | $ 171.3

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