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Marketable Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jun. 30, 2017
Marketable Securities |  |  |
Amortized Cost |  | $ 2,253,176 | $ 2,674,437
Gross Unrealized Gains |  | 220 | 712
Gross Unrealized Losses |  | (9,866) | (5,225)
Fair Value |  | 2,243,530 | 2,669,924
Add: Time deposits | [1] | 33,581 | 39,389
Less: Cash equivalents, Amortized Cost |  | 592,315 | 845,639
Less: Cash equivalents, Gross Unrealized Gains |  | 0 | 0
Less: Cash equivalents, Gross Unrealized Losses |  | 0 | (15)
Less: Cash equivalents, Fair Value |  | 592,315 | 845,624
Marketable securities, Amortized Cost |  | 1,694,442 | 1,868,187
Marketable securities, Gross Unrealized Gains |  | 220 | 712
Marketable securities, Gross Unrealized Losses |  | (9,866) | (5,210)
Marketable securities, Fair Value |  | 1,684,796 | 1,863,689
Corporate debt securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 918,399 | 1,120,548
Gross Unrealized Gains |  | 204 | 598
Gross Unrealized Losses |  | (4,245) | (1,951)
Fair Value |  | 914,358 | 1,119,195
Money market funds and other |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 569,287 | 616,039
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 569,287 | 616,039
Sovereign securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 11,496 | 52,621
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (69) | (56)
Fair Value |  | 11,427 | 52,565
U.S. Government agency securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 342,325 | 510,553
Gross Unrealized Gains |  | 16 | 62
Gross Unrealized Losses |  | (2,611) | (1,789)
Fair Value |  | 339,730 | 508,826
U.S. Treasury securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 411,669 | 374,676
Gross Unrealized Gains |  | 0 | 52
Gross Unrealized Losses |  | (2,941) | (1,429)
Fair Value |  | $ 408,728 | $ 373,299
Corporate and Government securities |  |  |
Marketable Securities |  |  |
Investment portfolio, maximum maturity term |  | 3 years |
[1] | Time deposits excluded from fair value measurements.

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