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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 210,256 | $ 203,850 | $ 173,532
Other comprehensive income (loss) net of tax: |  |  |
Net unrealized gains (losses) on available-for-sale securities | 39,195 | (21,136) | (7,587)
Reclassification adjustment of net gain (loss) from sale of available-for-sale securities included in net income | (9) | 0 | 3,499
Related tax benefit (expense) | (8,915) | 6,156 | 1,503
Other comprehensive income (loss) on available-for-sale securities, net of tax | 30,271 | (14,980) | (2,585)
Net unrealized gain (loss) on long-term borrowing hedges | (30,127) | 23,943 | 29,653
Related tax benefit (expense) | 6,854 | (5,684) | (10,897)
Other comprehensive income (loss) on cash flow hedges of borrowings, net of tax | (23,273) | 18,259 | 18,756
Other comprehensive income (loss) | 6,998 | 3,279 | 16,171
Comprehensive income | $ 217,254 | $ 207,129 | $ 189,703

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