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Marketable Securities - Amortized Costs and Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | ---
Marketable Securities |  |  |
Amortized Cost |  | $ 2,366,008 | $ 2,674,437
Gross Unrealized Gains |  | 167 | 712
Gross Unrealized Losses |  | (14,168) | (5,225)
Fair Value |  | 2,352,007 | 2,669,924
Add: Time deposits | [1] | 54,537 | 39,389
Less: Cash equivalents, Amortized Cost |  | 930,608 | 845,639
Less: Cash equivalents, Gross Unrealized Gains |  | 0 | 0
Less: Cash equivalents, Gross Unrealized Losses |  | 0 | (15)
Less: Cash equivalents, Fair Value |  | 930,608 | 845,624
Marketable securities, Amortized Cost |  | 1,489,937 | 1,868,187
Marketable securities, Gross Unrealized Gains |  | 167 | 712
Marketable securities, Gross Unrealized Losses |  | (14,168) | (5,210)
Marketable securities, Fair Value |  | 1,475,936 | 1,863,689
Corporate debt securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 747,763 | 1,120,548
Gross Unrealized Gains |  | 148 | 598
Gross Unrealized Losses |  | (7,508) | (1,951)
Fair Value |  | 740,403 | 1,119,195
Money market funds and other |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 863,115 | 616,039
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 863,115 | 616,039
Sovereign securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 17,293 | 52,621
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (151) | (56)
Fair Value |  | 17,142 | 52,565
U.S. Government agency securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 326,508 | 510,553
Gross Unrealized Gains |  | 16 | 62
Gross Unrealized Losses |  | (2,827) | (1,789)
Fair Value |  | 323,697 | 508,826
U.S. Treasury securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 411,329 | 374,676
Gross Unrealized Gains |  | 3 | 52
Gross Unrealized Losses |  | (3,682) | (1,429)
Fair Value |  | $ 407,650 | $ 373,299
[1] | Time deposits excluded from fair value measurements.

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