Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Continuous Unrealized Loss Position (Details)

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Marketable Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
 6 Months Ended
Dec. 31, 2015
USD ($)
Investments in an Unrealized Loss Position  
Fair Value $ 1,171,516
Gross Unrealized Losses, less than 12 months $ (3,413) [1]
Continuous loss position not exceeding this period 12 months
U.S. Treasury securities  
Investments in an Unrealized Loss Position  
Fair Value $ 250,397
Gross Unrealized Losses, less than 12 months (630) [1]
U.S. Government agency securities  
Investments in an Unrealized Loss Position  
Fair Value 298,143
Gross Unrealized Losses, less than 12 months (745) [1]
Municipal securities  
Investments in an Unrealized Loss Position  
Fair Value 3,005
Gross Unrealized Losses, less than 12 months (4) [1]
Corporate debt securities  
Investments in an Unrealized Loss Position  
Fair Value 584,219
Gross Unrealized Losses, less than 12 months (1,990) [1]
Sovereign securities  
Investments in an Unrealized Loss Position  
Fair Value 35,752
Gross Unrealized Losses, less than 12 months $ (44) [1]
[1] As of December 31, 2015, the amount of total gross unrealized losses related to investments that had been in a continuous loss position for 12 months or more was immaterial.