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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 164,049 | $ 160,316 | $ 157,364
Other comprehensive income (loss) net of tax: |  |  |
Net unrealized gains (losses) on available-for-sale securities | (1,403) | (27,536) | 22,924
Reclassification adjustment of net gains from sale of available-for-sale securities included in net income | 0 | 9,641 | 0
Related tax benefit (expense) | 516 | 6,577 | (8,425)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | (887) | (11,318) | 14,499
Net unrealized gain (loss) on long-term borrowing hedges | (16,793) | (14,287) | (268)
Related tax benefit (expense) | 6,171 | 5,250 | 99
Derivatives qualifying as hedges, net of tax, portion attributable to parent | (10,622) | (9,037) | (169)
Other comprehensive income (loss) | (11,509) | (20,355) | 14,330
Comprehensive income | $ 152,540 | $ 139,961 | $ 171,694

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