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Fair Value Measurements - Securities in Unrealized Loss Positions (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Unrealized loss position, less than 12 months, aggregate losses $ (3,514) $ (812)
Unrealized loss position, less than 12 months, fair value 622,801 360,665
Unrealized loss position, 12 months or longer, aggregate losses (41,539) (57,353)
Unrealized loss position, 12 months or longer, fair value 1,536,911 1,642,718
Unrealized loss position, aggregate losses (45,053) (58,165)
Unrealized loss position, fair value 2,159,712 2,003,383
Corporate Bond Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized loss position, less than 12 months, aggregate losses (1,022) (125)
Unrealized loss position, less than 12 months, fair value 23,978 24,875
Unrealized loss position, 12 months or longer, aggregate losses (625) (845)
Unrealized loss position, 12 months or longer, fair value 34,375 24,155
Unrealized loss position, aggregate losses (1,647) (970)
Unrealized loss position, fair value 58,353 49,030
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized loss position, less than 12 months, aggregate losses (15)  
Unrealized loss position, less than 12 months, fair value 3,558  
Unrealized loss position, 12 months or longer, aggregate losses 0  
Unrealized loss position, 12 months or longer, fair value 0  
Unrealized loss position, aggregate losses (15)  
Unrealized loss position, fair value 3,558  
US Government Agencies Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized loss position, less than 12 months, aggregate losses (558) (472)
Unrealized loss position, less than 12 months, fair value 140,285 316,578
Unrealized loss position, 12 months or longer, aggregate losses (969) (797)
Unrealized loss position, 12 months or longer, fair value 142,318 109,354
Unrealized loss position, aggregate losses (1,527) (1,269)
Unrealized loss position, fair value 282,603 425,932
Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized loss position, less than 12 months, aggregate losses (1,919) (215)
Unrealized loss position, less than 12 months, fair value 454,980 19,212
Unrealized loss position, 12 months or longer, aggregate losses (39,945) (55,711)
Unrealized loss position, 12 months or longer, fair value 1,360,218 1,509,209
Unrealized loss position, aggregate losses (41,864) (55,926)
Unrealized loss position, fair value $ 1,815,198 $ 1,528,421