Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Contractual Maturities (Details)

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Marketable Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Amortized Cost    
Due within one year $ 567,385  
Due after one year through three years 341,055  
Marketable securities, Amortized Cost 908,440 $ 1,489,937
Fair Value    
Due within one year 563,316  
Due after one year through three years 336,796  
Marketable securities, Fair value $ 900,112 $ 1,475,936