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Fair Value Measurements - Securities in Unrealized Loss Positions (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, unrealized gross losses $ (5,622) $ (6,229)
Less than 12 months, fair value 513,643 578,646
12 months or more, unrealized gross losses (8,555) (23,128)
12 months or more, fair value 559,111 1,297,408
Total unrealized gross losses (14,177) (29,357)
Total, fair value 1,072,754 1,876,054
Corporate bonds due    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, unrealized gross losses (512) (183)
Less than 12 months, fair value 19,442 72,862
12 months or more, unrealized gross losses (2,387) (3,399)
12 months or more, fair value 57,613 46,601
Total unrealized gross losses (2,899) (3,582)
Total, fair value 77,055 119,463
U.S. government and agency securities due    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, unrealized gross losses (3,199) (5,010)
Less than 12 months, fair value 122,397 336,243
12 months or more, unrealized gross losses (2,475) (1,452)
12 months or more, fair value 116,082 57,344
Total unrealized gross losses (5,674) (6,462)
Total, fair value 238,479 393,587
Agency pass-through certificates    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, unrealized gross losses (1,911) (1,036)
Less than 12 months, fair value 371,804 169,541
12 months or more, unrealized gross losses (3,693) (18,277)
12 months or more, fair value 385,416 1,193,463
Total unrealized gross losses (5,604) (19,313)
Total, fair value $ 757,220 $ 1,363,004