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Investments - Cash Flows from Consolidated Investing Activities by Security (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Proceeds from investments sold, matured or repaid: |  |  |
Total proceeds from investments sold, matured or repaid | $ 6,206,696 | $ 1,699,919 | $ 30,094
Cost of investments acquired: |  |  |
Cost of investments acquired | 5,972,715 | 1,808,999 | 3,989
Available-for-sale [Member] |  |  |
Proceeds from investments sold, matured or repaid: |  |  |
Total proceeds from investments sold, matured or repaid | 5,833,423 | 1,482,195 |
Cost of investments acquired: |  |  |
Cost of investments acquired | 5,640,090 | 1,285,951 |
Held-to-maturity [Member] |  |  |
Proceeds from investments sold, matured or repaid: |  |  |
Total proceeds from investments sold, matured or repaid | 109,636 | 101,755 | 30,094
Cost of investments acquired: |  |  |
Cost of investments acquired | 68,733 | 123,428 | 3,989
Trading [Member] |  |  |
Proceeds from investments sold, matured or repaid: |  |  |
Total proceeds from investments sold, matured or repaid | 106,074 | 29,532 |
Cost of investments acquired: |  |  |
Cost of investments acquired | 122,289 | 332,715 |
Derivatives and other [Member] |  |  |
Proceeds from investments sold, matured or repaid: |  |  |
Total proceeds from investments sold, matured or repaid | 157,563 | 86,437 |
Cost of investments acquired: |  |  |
Cost of investments acquired | $ 141,603 | $ 66,905 |

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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 31 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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