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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

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a 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 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + 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 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a 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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