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Marketable Securities - Contractual Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 442,133 |
Due after one year through three years | 320,897 |
Marketable securities, Amortized Cost | 763,030 | $ 724,449
Fair Value |  |
Due within one year | 441,938 |
Due after one year through three years | 321,236 |
Marketable securities, Fair value | $ 763,174 | $ 723,391

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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