Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Details)

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Marketable Securities (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Jun. 30, 2012
Marketable Securities          
Net realized securities gains $ 700,000 $ 100,000 $ 2,100,000 $ 700,000  
Amortized Cost 2,664,654,000   2,664,654,000   2,341,750,000
Gross Unrealized Gains 5,692,000   5,692,000   5,070,000
Gross Unrealized Losses (397,000)   (397,000)   (762,000)
Fair Value 2,669,949,000   2,669,949,000   2,346,058,000
Add: Time deposits 53,500,000 [1]   53,500,000 [1]   62,431,000 [1]
Less: Cash Equivalents, Amortized Cost 778,147,000   778,147,000   625,339,000
Cash Equivalents, Gross Unrealized Gains     0   0
Cash Equivalents, Gross Unrealized Losses     0   0
Cash Equivalents, Net of Unrealized Gains and Losses 778,147,000   778,147,000   625,339,000
Marketable Securities, Gross Unrealized Gains 5,692,000   5,692,000   5,070,000
Marketable Securities, Gross Unrealized Losses (397,000)   (397,000)   (762,000)
Contractual Maturities of Securities [Abstract]          
Due within one year, Amortized Cost 456,433,000   456,433,000    
Due after one year through three years, Amortized Cost 1,483,574,000   1,483,574,000    
Marketable Securities, Amortized Cost 1,940,007,000   1,940,007,000   1,778,842,000
Due within one year, Fair Value 457,332,000   457,332,000    
Due after one year through three years, Fair Value 1,487,970,000   1,487,970,000    
Marketable Securities, Fair Value 1,945,302,000   1,945,302,000   1,783,150,000
U.S. Treasury securities
          
Marketable Securities          
Amortized Cost 98,853,000   98,853,000   91,387,000
Gross Unrealized Gains 169,000   169,000   67,000
Gross Unrealized Losses (1,000)   (1,000)   (16,000)
Fair Value 99,021,000   99,021,000   91,438,000
U.S. Government agency securities
          
Marketable Securities          
Amortized Cost 658,805,000   658,805,000   633,587,000
Gross Unrealized Gains 1,028,000   1,028,000   981,000
Gross Unrealized Losses (6,000)   (6,000)   (76,000)
Fair Value 659,827,000   659,827,000   634,492,000
Municipal securities
          
Marketable Securities          
Amortized Cost 82,663,000   82,663,000   66,538,000
Gross Unrealized Gains 128,000   128,000   107,000
Gross Unrealized Losses (62,000)   (62,000)   (102,000)
Fair Value 82,729,000   82,729,000   66,543,000
Corporate debt securities
          
Marketable Securities          
Amortized Cost 1,065,519,000   1,065,519,000   914,134,000
Gross Unrealized Gains 4,322,000   4,322,000   3,826,000
Gross Unrealized Losses (321,000)   (321,000)   (568,000)
Fair Value 1,069,520,000   1,069,520,000   917,392,000
Money market and other
          
Marketable Securities          
Amortized Cost 735,000,000   735,000,000   607,038,000
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses 0   0   0
Fair Value 735,000,000   735,000,000   607,038,000
Sovereign securities
          
Marketable Securities          
Amortized Cost 23,814,000   23,814,000   29,056,000
Gross Unrealized Gains 45,000   45,000   89,000
Gross Unrealized Losses (7,000)   (7,000)   0
Fair Value 23,852,000   23,852,000   29,145,000
Equity securities
          
Marketable Securities          
Amortized Cost         10,000
Gross Unrealized Gains         0
Gross Unrealized Losses         0
Fair Value         $ 10,000
[1] Time deposits excluded from fair value measurements.