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Marketable Securities - Amortized Costs and Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | ---
Marketable Securities |  |  |
Amortized Cost |  | $ 2,674,437 | $ 2,079,863
Gross Unrealized Gains |  | 712 | 4,423
Gross Unrealized Losses |  | (5,225) | (176)
Fair value |  | 2,669,924 | 2,084,110
Add: Time deposits | [1] | 39,389 | 77,131
Less: Cash equivalents, Amortized Cost |  | 845,639 | 778,451
Less: Cash equivalents, Gross Unrealized Gains |  | 0 | 1
Less: Cash equivalents, Gross Unrealized Losses |  | (15) | (17)
Less: Cash equivalents, Fair Value |  | 845,624 | 778,435
Marketable securities, Amortized Cost |  | 1,868,187 | 1,378,543
Marketable securities, Gross Unrealized Gains |  | 712 | 4,422
Marketable securities, Gross Unrealized Losses |  | (5,210) | (159)
Marketable securities, Fair Value |  | 1,863,689 | 1,382,806
Corporate debt securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 1,120,548 | 676,259
Gross Unrealized Gains |  | 598 | 2,372
Gross Unrealized Losses |  | (1,951) | (157)
Fair value |  | 1,119,195 | 678,474
Money market funds and other |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 616,039 | 626,156
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair value |  | 616,039 | 626,156
Municipal securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  |  | 5,014
Gross Unrealized Gains |  |  | 2
Gross Unrealized Losses |  |  | 0
Fair value |  |  | 5,016
Sovereign securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 52,621 | 41,224
Gross Unrealized Gains |  | 0 | 38
Gross Unrealized Losses |  | (56) | (5)
Fair value |  | 52,565 | 41,257
U.S. Government agency securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 510,553 | 404,889
Gross Unrealized Gains |  | 62 | 830
Gross Unrealized Losses |  | (1,789) | (14)
Fair value |  | 508,826 | 405,705
U.S. Treasury securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 374,676 | 326,321
Gross Unrealized Gains |  | 52 | 1,181
Gross Unrealized Losses |  | (1,429) | 0
Fair value |  | $ 373,299 | $ 327,502
[1] | Time deposits excluded from fair value measurements.

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