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, 2012
Jun. 30, 2011
Jun. 30, 2010
Investments, Fair Value and Gross Unrealized Losses      
Net realized investment gains $ 600,000 $ 2,500,000 $ 4,000,000
Months in loss position not exceeding this period 12    
Fair value 426,572,000    
Gross unrealized losses, less than 12 months (762,000) [1]    
Gross unrealized losses, 12 months or longer 0    
US Treasury securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 47,093,000    
Gross unrealized losses, less than 12 months (16,000) [1]    
U.S. Government agency securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 115,894,000    
Gross unrealized losses, less than 12 months (76,000) [1]    
Municipal securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 38,399,000    
Gross unrealized losses, less than 12 months (102,000) [1]    
Corporate debt securities
      
Investments, Fair Value and Gross Unrealized Losses      
Fair value 225,186,000    
Gross unrealized losses, less than 12 months $ (568,000) [1]    
[1] Of the total gross unrealized losses, there were no amounts that, as of June 30, 2012, had been in a continuous loss position for 12 months or more.