Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Details)

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Marketable Securities (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Marketable Securities          
Amortized Cost $ 2,805,508,000   $ 2,805,508,000   $ 2,750,942,000
Gross Unrealized Gains 3,758,000   3,758,000   3,071,000
Gross Unrealized Losses (1,338,000)   (1,338,000)   (4,002,000)
Fair Value 2,807,928,000   2,807,928,000   2,750,011,000
Add: Time deposits 19,942,000 [1]   19,942,000 [1]   43,413,000 [1]
Less: Cash Equivalents, Amortized Cost 670,591,000   670,591,000   859,933,000
Cash Equivalents, Gross Unrealized Gains     0   0
Cash Equivalents, Gross Unrealized Losses     0   0
Less: Cash Equivalents, Fair Value 670,591,000   670,591,000   859,933,000
Marketable Securities, Gross Unrealized Gains     3,758,000   3,071,000
Marketable Securities, Gross Unrealized Losses     (1,338,000)   (4,002,000)
Contractual Maturities of Securities [Abstract]          
Due within one year, Amortized Cost 532,278,000   532,278,000    
Due after one year through three years, Amortized Cost 1,622,581,000   1,622,581,000    
Marketable Securities, Amortized Cost 2,154,859,000   2,154,859,000   1,934,422,000
Due within one year, Fair Value 533,124,000   533,124,000    
Due after one year through three years, Fair Value 1,624,155,000   1,624,155,000    
Marketable Securities, Fair Value 2,157,279,000   2,157,279,000   1,933,491,000
Available-for-sale Securities, Gross Realized Gains 1,200,000 1,100,000 1,500,000 1,400,000  
U.S. Treasury securities
          
Marketable Securities          
Amortized Cost 168,354,000   168,354,000   93,940,000
Gross Unrealized Gains 70,000   70,000   53,000
Gross Unrealized Losses (111,000)   (111,000)   (206,000)
Fair Value 168,313,000   168,313,000   93,787,000
U.S. Government agency securities
          
Marketable Securities          
Amortized Cost 751,314,000   751,314,000   598,471,000
Gross Unrealized Gains 614,000   614,000   569,000
Gross Unrealized Losses (295,000)   (295,000)   (1,009,000)
Fair Value 751,633,000   751,633,000   598,031,000
Municipal securities
          
Marketable Securities          
Amortized Cost 107,740,000   107,740,000   103,686,000
Gross Unrealized Gains 92,000   92,000   71,000
Gross Unrealized Losses (245,000)   (245,000)   (302,000)
Fair Value 107,587,000   107,587,000   103,455,000
Corporate debt securities
          
Marketable Securities          
Amortized Cost 1,166,754,000   1,166,754,000   1,103,438,000
Gross Unrealized Gains 2,967,000   2,967,000   2,353,000
Gross Unrealized Losses (669,000)   (669,000)   (2,466,000)
Fair Value 1,169,052,000   1,169,052,000   1,103,325,000
Money market and other
          
Marketable Securities          
Amortized Cost 574,904,000   574,904,000   817,608,000
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses 0   0   0
Fair Value 574,904,000   574,904,000   817,608,000
Sovereign securities
          
Marketable Securities          
Amortized Cost 36,442,000   36,442,000   33,799,000
Gross Unrealized Gains 15,000   15,000   25,000
Gross Unrealized Losses (18,000)   (18,000)   (19,000)
Fair Value $ 36,439,000   $ 36,439,000   $ 33,805,000
[1] Time deposits excluded from fair value measurements.