Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Details)

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Marketable Securities (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Marketable Securities      
Amortized Cost $ 2,809,492,000   $ 3,008,210,000
Gross Unrealized Gains 1,604,000   4,603,000
Gross Unrealized Losses (1,776,000)   (405,000)
Fair Value 2,809,320,000   3,012,408,000
Add: Time deposits 27,830,000 [1]   33,509,000 [1]
Less: Cash Equivalents, Amortized Cost 564,344,000   524,149,000
Cash Equivalents, Gross Unrealized Gains 0   0
Cash Equivalents, Gross Unrealized Losses (3,000)   (8,000)
Less: Cash Equivalents, Fair Value 564,341,000   524,141,000
Marketable Securities, Gross Unrealized Gains 1,604,000   4,603,000
Marketable Securities, Gross Unrealized Losses (1,773,000)   (397,000)
Contractual Maturities of Securities [Abstract]      
Due within one year, Amortized Cost 778,612,000    
Due after one year through three years, Amortized Cost 1,494,366,000    
Marketable Securities, Amortized Cost 2,272,978,000   2,517,570,000
Due within one year, Fair Value 779,234,000    
Due after one year through three years, Fair Value 1,493,575,000    
Marketable Securities, Fair Value 2,272,809,000   2,521,776,000
Available-for-sale Securities, Gross Realized Gains 1,700,000 300,000  
U.S. Treasury securities
      
Marketable Securities      
Amortized Cost 323,560,000   384,165,000
Gross Unrealized Gains 84,000   287,000
Gross Unrealized Losses (140,000)   (52,000)
Fair Value 323,504,000   384,400,000
U.S. Government agency securities
      
Marketable Securities      
Amortized Cost 851,734,000   867,309,000
Gross Unrealized Gains 246,000   651,000
Gross Unrealized Losses (708,000)   (117,000)
Fair Value 851,272,000   867,843,000
Municipal securities
      
Marketable Securities      
Amortized Cost 79,880,000   96,198,000
Gross Unrealized Gains 54,000   93,000
Gross Unrealized Losses (66,000)   (75,000)
Fair Value 79,868,000   96,216,000
Corporate debt securities
      
Marketable Securities      
Amortized Cost 1,054,280,000   1,220,794,000
Gross Unrealized Gains 1,185,000   3,526,000
Gross Unrealized Losses (843,000)   (152,000)
Fair Value 1,054,622,000   1,224,168,000
Money market and other
      
Marketable Securities      
Amortized Cost 451,045,000   397,517,000
Gross Unrealized Gains 0   0
Gross Unrealized Losses 0   0
Fair Value 451,045,000   397,517,000
Sovereign securities
      
Marketable Securities      
Amortized Cost 48,993,000   42,227,000
Gross Unrealized Gains 35,000   46,000
Gross Unrealized Losses (19,000)   (9,000)
Fair Value $ 49,009,000   $ 42,264,000
[1] Time deposits excluded from fair value measurements.