Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Details)

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Marketable Securities (Details) (USD $)
 3 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2012
Marketable Securities      
Amortized Cost $ 2,751,885,000 $ 2,750,942,000  
Gross Unrealized Gains 4,619,000 3,071,000  
Gross Unrealized Losses (1,646,000) (4,002,000)  
Fair Value 2,754,858,000 2,750,011,000  
Add: Time deposits 20,713,000 [1] 43,413,000 [1]  
Less: Cash Equivalents, Amortized Cost 728,645,000 859,933,000  
Cash Equivalents, Gross Unrealized Gains 0 0  
Cash Equivalents, Gross Unrealized Losses 0 0  
Less: Cash Equivalents, Fair Value 728,645,000 859,933,000  
Marketable Securities, Gross Unrealized Gains 4,619,000 3,071,000  
Marketable Securities, Gross Unrealized Losses (1,646,000) (4,002,000)  
Contractual Maturities of Securities [Abstract]      
Due within one year, Amortized Cost 478,400,000    
Due after one year through three years, Amortized Cost 1,565,553,000    
Marketable Securities, Amortized Cost 2,043,953,000 1,934,422,000  
Due within one year, Fair Value 480,079,000    
Due after one year through three years, Fair Value 1,566,847,000    
Marketable Securities, Fair Value 2,046,926,000 1,933,491,000  
Available-for-sale Securities, Gross Realized Gains 300,000   300,000
U.S. Treasury securities
      
Marketable Securities      
Amortized Cost 147,198,000 93,940,000  
Gross Unrealized Gains 100,000 53,000  
Gross Unrealized Losses (62,000) (206,000)  
Fair Value 147,236,000 93,787,000  
U.S. Government agency securities
      
Marketable Securities      
Amortized Cost 684,400,000 598,471,000  
Gross Unrealized Gains 754,000 569,000  
Gross Unrealized Losses (405,000) (1,009,000)  
Fair Value 684,749,000 598,031,000  
Municipal securities
      
Marketable Securities      
Amortized Cost 104,743,000 103,686,000  
Gross Unrealized Gains 60,000 71,000  
Gross Unrealized Losses (270,000) (302,000)  
Fair Value 104,533,000 103,455,000  
Corporate debt securities
      
Marketable Securities      
Amortized Cost 1,095,912,000 1,103,438,000  
Gross Unrealized Gains 2,919,000 2,353,000  
Gross Unrealized Losses (895,000) (2,466,000)  
Fair Value 1,097,936,000 1,103,325,000  
Money market and other
      
Marketable Securities      
Amortized Cost 685,074,000 817,608,000  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 0  
Fair Value 685,074,000 817,608,000  
Sovereign securities
      
Marketable Securities      
Amortized Cost 33,198,000 33,799,000  
Gross Unrealized Gains 18,000 25,000  
Gross Unrealized Losses (14,000) (19,000)  
Fair Value 33,202,000 33,805,000  
Equity securities
      
Marketable Securities      
Amortized Cost 1,360,000    
Gross Unrealized Gains 768,000    
Gross Unrealized Losses 0    
Fair Value $ 2,128,000    
[1] Time deposits excluded from fair value measurements.