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, 2014
Jun. 30, 2013
Jun. 30, 2012
Investments, Fair Value and Gross Unrealized Losses      
Fair value $ 554,474,000    
Gross unrealized losses, less than 12 months (397,000) [1]    
Months in loss position not exceeding this period 12 months    
Available-for-sale Securities, Gross Realized Gains 2,200,000 2,500,000 2,100,000
Available-for-sale Securities, Gross Realized Losses 100,000 200,000 1,500,000
U.S. Treasury securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 192,159,000    
Gross unrealized losses, less than 12 months (52,000) [1]    
U.S. Government agency securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 163,701,000    
Gross unrealized losses, less than 12 months (117,000) [1]    
Municipal securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 38,243,000    
Gross unrealized losses, less than 12 months (73,000) [1]    
Corporate debt securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 147,555,000    
Gross unrealized losses, less than 12 months (146,000) [1]    
Sovereign securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 12,816,000    
Gross unrealized losses, less than 12 months $ (9,000) [1]    
[1] As of June 30, 2014, the amount of total gross unrealized losses that had been in a continuous loss position for 12 months or more was immaterial.