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Derivatives (Derivatives Associated with Fixed Income Trading Activities) (Details) - USD ($) | Sep. 30, 2015 | Sep. 30, 2014
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Customer Interest Rate Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | $ 1,670,717,000 | $ 1,731,047,000
Assets | 82,905,000 | 69,878,000
Liabilities | 1,512,000 | 5,778,000
Offsetting Upstream Interest Rate Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 1,670,717,000 | 1,731,047,000
Assets | 1,512,000 | 5,778,000
Liabilities | 82,905,000 | 69,878,000
Put Option [Member] | ShortMember |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional |  | 7,500,000
Assets |  | 0
Liabilities |  | 6,000
Put Option [Member] | LongMember |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 10,000,000 | 10,000,000
Assets | 23,000 | 27,000
Liabilities | 0 | 0
Forwards And Futures Purchased [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 3,458,150,000 | 1,866,521,000
Assets | 15,561,000 | 2,047,000
Liabilities | 353,000 | 614,000
Forwards And Futures Sold [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 3,578,542,000 | 2,311,144,000
Assets | 774,000 | 1,134,000
Liabilities | $ 15,568,000 | $ 2,281,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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