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Fair Value Measurements (Securities in Unrealized Loss Positions) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Mar. 31, 2014
Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses $ (40,176) $ (83,095)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,419,243 2,065,491
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (52,369) (1,711)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 956,313 190,357
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (92,545) (84,806)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,375,556 2,255,848
Corporate Bond Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (100) (660)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 49,900 52,434
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (76) (238)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 9,925 9,763
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (176) (898)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 59,825 62,197
US Government Agencies Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (2,158) (4,144)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 256,389 309,109
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (55) (66)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12,083 14,091
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (2,213) (4,210)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 268,472 323,200
Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (37,918) (78,291)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,112,954 1,703,948
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (52,238) (1,407)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 934,305 166,503
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (90,156) (79,698)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 2,047,259 $ 1,870,451