Annual report pursuant to Section 13 and 15(d)

Marketable Securities - Continuous Unrealized Loss Position (Details)

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Marketable Securities - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Investments, Fair Value and Gross Unrealized Losses      
Investment portfolio, maximum maturity term 3 years    
Fair value $ 491,301    
Gross unrealized losses, less than 12 months [1] $ (697)    
Months in loss position not exceeding this period 12 months    
Available-for-sale Securities, Gross Realized Gains $ 2,400 $ 2,200 $ 2,500
Available-for-sale Securities, Gross Realized Losses 300 $ 100 $ 200
U.S. Treasury securities      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 34,508    
Gross unrealized losses, less than 12 months [1] (15)    
U.S. Government agency securities      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 133,933    
Gross unrealized losses, less than 12 months [1] (126)    
Municipal securities      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 9,776    
Gross unrealized losses, less than 12 months [1] (10)    
Corporate debt securities      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 286,355    
Gross unrealized losses, less than 12 months [1] (515)    
Sovereign securities      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 26,729    
Gross unrealized losses, less than 12 months [1] $ (31)    
[1] As of June 30, 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.