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Marketable Securities - Amortized Costs and Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jun. 30, 2018
--- | --- | ---
Marketable Securities |  |  |
Amortized Cost |  | $ 1,161,649 | $ 2,366,008
Gross Unrealized Gains |  | 189 | 167
Gross Unrealized Losses |  | (1,232) | (14,168)
Fair Value |  | 1,160,606 | 2,352,007
Add: Time deposits | [1] | 99,006 | 54,537
Marketable securities, Amortized Cost |  | 724,449 | 1,489,937
Marketable securities, Gross Unrealized Gains |  | 172 | 167
Marketable securities, Gross Unrealized Losses |  | (1,230) | (14,168)
Marketable securities, Fair value |  | 723,391 | 1,475,936
Corporate debt securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 433,518 | 747,763
Gross Unrealized Gains |  | 141 | 148
Gross Unrealized Losses |  | (582) | (7,508)
Fair Value |  | 433,077 | 740,403
Money market funds and other |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 352,708 | 863,115
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 352,708 | 863,115
Municipal securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 1,910 |
Gross Unrealized Gains |  | 3 |
Gross Unrealized Losses |  | 0 |
Fair Value |  | 1,913 |
Sovereign securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 6,001 | 17,293
Gross Unrealized Gains |  | 1 | 0
Gross Unrealized Losses |  | (8) | (151)
Fair Value |  | 5,994 | 17,142
U.S. Government agency securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 159,454 | 326,508
Gross Unrealized Gains |  | 5 | 16
Gross Unrealized Losses |  | (241) | (2,827)
Fair Value |  | 159,218 | 323,697
U.S. Treasury securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 208,058 | 411,329
Gross Unrealized Gains |  | 39 | 3
Gross Unrealized Losses |  | (401) | (3,682)
Fair Value |  | 207,696 | 407,650
Cash and Cash Equivalents |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 536,206 | 930,608
Gross Unrealized Gains |  | 17 | 0
Gross Unrealized Losses |  | (2) | 0
Fair Value |  | $ 536,221 | $ 930,608
[1] | Time deposits excluded from fair value measurements.

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