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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 151,505 | $ 138,183 | $ 111,141
Other comprehensive income (loss) net of tax: |  |  |
Net unrealized gains (losses) on available-for-sale securities | (10,953) | (209,832) | 48,939
Related tax benefit (expense) | 4,025 | 77,113 | (17,985)
Reclassification adjustment of net gains from sale of available-for-sale securities included in net income | 0 | 95,234 | 8,147
Related tax benefit (expense) | 0 | (34,998) | (2,994)
Other comprehensive income (loss) | (6,928) | (72,483) | 36,107
Comprehensive income | $ 144,577 | $ 65,700 | $ 147,248

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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