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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 49,271 | $ 42,070 | $ 100,941 | $ 83,316
Other comprehensive income (loss) net of tax: |  |  |  |
Net unrealized gain (loss) on available-for-sale investment securities | (11,467) | 5,685 | (13,431) | (11,394)
Reclassification adjustment of net gain (loss) from sale of available-for-sale securities included in net income | 0 | 0 | 0 | 968
Related tax benefit (expense) | 3,681 | (2,089) | 4,403 | 3,832
Other comprehensive income (loss) for available for sale securities, net of tax | (7,786) | 3,596 | (9,028) | (6,594)
Net unrealized gain (loss) on cash flow hedges of borrowings | 10,332 | 2,395 | 17,022 | 31,666
Related tax benefit (expense) | (1,651) | (880) | (4,110) | (11,637)
Other comprehensive income (loss) on long term borrowing hedge, net of tax | 8,681 | 1,515 | 12,912 | 20,029
Other comprehensive income (loss) net of tax | 895 | 5,111 | 2,112 | 13,435
Other comprehensive income (loss), including cumulative effect adjustment, net of tax |  |  | 3,884 |
Comprehensive income | $ 50,166 | $ 47,181 | $ 104,825 | $ 96,751

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