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 $)
 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Investments, Fair Value and Gross Unrealized Losses      
Available-for-sale Securities, Gross Realized Gains $ 2,500,000 $ 2,100,000 $ 2,700,000
Available-for-sale Securities, Gross Realized Losses 200,000 1,500,000 200,000
Months in loss position not exceeding this period 12    
Fair value 1,047,048,000    
Gross unrealized losses, less than 12 months (4,002,000) [1]    
Gross unrealized losses, 12 months or longer 0    
U.S. Treasury securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 50,475,000    
Gross unrealized losses, less than 12 months (206,000) [1]    
U.S. Government agency securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 323,053,000    
Gross unrealized losses, less than 12 months (1,009,000) [1]    
Municipal securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 56,919,000    
Gross unrealized losses, less than 12 months (302,000) [1]    
Corporate debt securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 595,513,000    
Gross unrealized losses, less than 12 months (2,466,000) [1]    
Sovereign securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 21,088,000    
Gross unrealized losses, less than 12 months $ (19,000) [1]    
[1] As of June 30, 2013, the amount of total gross unrealized losses that had been in a continuous loss position for 12 months or more was immaterial.