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CONSOLIDATED STATEMENTS OF COMMON STOCK EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Premium on Common Stock | Accumulated Other Comprehensive (Loss) Income | Accumulated Other Comprehensive (Loss) Income Cumulative Effect, Period of Adoption, Adjustment | Treasury Stock And Other | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Sep. 30, 2017 |  |  |  | 86,556,000 |  |  |  |  |  |
Beginning Balance at Sep. 30, 2017 |  | $ 1,236,643 |  | $ 222,258 | $ 219,696 | $ (3,256) |  | $ (70,039) | $ 867,984 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income |  | 233,436 |  |  |  |  |  |  | 233,436 |
Other comprehensive income (loss) |  | (6,078) |  |  |  | (6,078) |  |  |  |
Common stock issued: |  |  |  |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  |  | 561,000 |  |  |  |  |  |
Incentive compensation plan |  | 16,572 |  | $ 1,403 | 15,169 |  |  |  |  |
Dividend reinvestment plan (in shares) | [1] |  |  | 413,000 |  |  |  |  |  |
Dividend reinvestment plan | [1] | 17,094 |  |  | 755 |  |  | 16,339 |  |
Waiver discount (in shares) |  |  |  | 1,014,000 |  |  |  |  |  |
Waiver discount |  | 41,677 |  | $ 2,535 | 39,142 |  |  |  |  |
Cash dividend declared ($0.3125 per share in 2020, $1.19 per share in 2019, and $1.11 per share in 2018) |  | (97,579) |  |  |  |  |  |  | (97,579) |
Treasury stock and other (in shares) |  |  |  | (251,000) |  |  |  |  |  |
Treasury stock and other |  | (22,787) |  |  | (14) |  |  | (22,773) |  |
Reclassifications of certain income tax effects to retained earnings |  |  |  |  |  | (3,276) |  |  | 3,276 |
Ending Balance (in shares) at Sep. 30, 2018 |  |  |  | 88,293,000 |  |  |  |  |  |
Ending Balance at Sep. 30, 2018 |  | 1,418,978 |  | $ 226,196 | 274,748 | (12,610) |  | (76,473) | 1,007,117 |
Ending Balance (Accounting Standards Update 2016-01) at Sep. 30, 2018 | [2] |  |  |  |  |  | $ (3,446) |  |  | $ 3,446
Ending Balance (Accounting Standards Update 2017-05) at Sep. 30, 2018 | [2] |  | $ 4,970 |  |  |  |  |  |  | 4,970
Ending Balance (Accounting Standards Update 2014-09) at Sep. 30, 2018 | [2] |  | $ (2,736) |  |  |  |  |  |  | $ (2,736)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income |  | 169,505 |  |  |  |  |  |  | 169,505 |
Other comprehensive income (loss) |  | (15,731) |  |  |  | (15,731) |  |  |  |
Common stock issued: |  |  |  |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  |  | 182,000 |  |  |  |  |  |
Incentive compensation plan |  | 3,787 |  | $ 453 | 3,334 |  |  |  |  |
Dividend reinvestment plan (in shares) | [1] |  |  | 351,000 |  |  |  |  |  |
Dividend reinvestment plan | [1] | 16,663 |  |  | 2,718 |  |  | 13,945 |  |
Waiver discount (in shares) |  |  |  | 1,181,000 |  |  |  |  |  |
Waiver discount |  | 57,391 |  |  | 10,531 |  |  | 46,860 |  |
Cash dividend declared ($0.3125 per share in 2020, $1.19 per share in 2019, and $1.11 per share in 2018) |  | (106,342) |  |  |  |  |  |  | (106,342) |
Treasury stock and other (in shares) |  |  |  | (8,000) |  |  |  |  |  |
Treasury stock and other |  | $ 5,232 |  |  |  |  |  | 5,232 |  |
Ending Balance (in shares) at Sep. 30, 2019 |  | 89,998,788 |  | 89,999,000 |  |  |  |  |  |
Ending Balance at Sep. 30, 2019 |  | $ 1,551,717 |  | $ 226,649 | 291,331 | (31,787) |  | (10,436) | 1,075,960 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income |  | 193,919 |  |  |  |  |  |  | 193,919 |
Other comprehensive income (loss) |  | (12,528) |  |  |  | (12,528) |  |  |  |
Common stock issued: |  |  |  |  |  |  |  |  |  |
Common stock offering (in shares) |  |  |  | 5,333,000 |  |  |  |  |  |
Common stock offering |  | 212,900 |  | $ 13,333 | 199,567 |  |  |  |  |
Incentive compensation plan (in shares) |  |  |  | 105,000 |  |  |  |  |  |
Incentive compensation plan |  | 3,772 |  | $ 261 | 3,511 |  |  |  |  |
Dividend reinvestment plan (in shares) | [1] |  |  | 520,000 |  |  |  |  |  |
Dividend reinvestment plan | [1] | 18,157 |  |  | 2,833 |  |  | 15,324 |  |
Cash dividend declared ($0.3125 per share in 2020, $1.19 per share in 2019, and $1.11 per share in 2018) |  | (121,582) |  |  |  |  |  |  | (121,582) |
Treasury stock and other (in shares) |  |  |  | (8,000) |  |  |  |  |  |
Treasury stock and other |  | $ (1,663) |  |  | (5,260) |  |  | 3,597 |  |
Ending Balance (in shares) at Sep. 30, 2020 |  | 95,949,183 |  | 95,949,000 |  |  |  |  |  |
Ending Balance at Sep. 30, 2020 |  | $ 1,844,692 |  | $ 240,243 | $ 491,982 | $ (44,315) |  | $ 8,485 | $ 1,148,297 |
[1] | Shares sold through the DRP are issued from treasury stock at average cost, which may differ from the actual market price paid.
[2] | See Note 2. Summary of Significant Accounting Policies - Recently Adopted Updates to the Accounting Standards Codification section for more details.

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