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Fair Value Measurements - Securities in Unrealized Loss Positions (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Sep. 30, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, unrealized gross losses | $ (5,612) | $ (6,229)
Less than 12 months, fair value | 470,410 | 578,646
12 months or more, unrealized gross losses | (13,401) | (23,128)
12 months or more, fair value | 1,366,075 | 1,297,408
Total unrealized gross losses | (19,013) | (29,357)
Total, fair value | 1,836,485 | 1,876,054
Corporate bonds due |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, unrealized gross losses | (1,001) | (183)
Less than 12 months, fair value | 24,000 | 72,862
12 months or more, unrealized gross losses | (1,899) | (3,399)
12 months or more, fair value | 33,101 | 46,601
Total unrealized gross losses | (2,900) | (3,582)
Total, fair value | 57,101 | 119,463
U.S. government and agency securities due |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, unrealized gross losses | (3,136) | (5,010)
Less than 12 months, fair value | 138,259 | 336,243
12 months or more, unrealized gross losses | (2,208) | (1,452)
12 months or more, fair value | 115,518 | 57,344
Total unrealized gross losses | (5,344) | (6,462)
Total, fair value | 253,777 | 393,587
Agency pass-through certificates |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, unrealized gross losses | (1,475) | (1,036)
Less than 12 months, fair value | 308,151 | 169,541
12 months or more, unrealized gross losses | (9,294) | (18,277)
12 months or more, fair value | 1,217,456 | 1,193,463
Total unrealized gross losses | (10,769) | (19,313)
Total, fair value | $ 1,525,607 | $ 1,363,004

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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