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) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Dec. 31, 2013
Investments in an Unrealized Loss Position  
Fair Value $ 704,855
Gross Unrealized Losses, less than 12 months (1,338) [1]
Continuous loss position not exceeding this period 12 months
U.S. Treasury securities
  
Investments in an Unrealized Loss Position  
Fair Value 68,423
Gross Unrealized Losses, less than 12 months (111) [1]
U.S. Government agency securities
  
Investments in an Unrealized Loss Position  
Fair Value 249,078
Gross Unrealized Losses, less than 12 months (295) [1]
Municipal securities
  
Investments in an Unrealized Loss Position  
Fair Value 55,784
Gross Unrealized Losses, less than 12 months (245) [1]
Corporate debt securities
  
Investments in an Unrealized Loss Position  
Fair Value 310,332
Gross Unrealized Losses, less than 12 months (669) [1]
Sovereign securities
  
Investments in an Unrealized Loss Position  
Fair Value 21,238
Gross Unrealized Losses, less than 12 months $ (18) [1]
[1] Of the total gross unrealized losses, 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.