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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Paid-in Capital | Retained Earnings (Accumulated Deficit)
--- | --- | --- | --- | ---
Beginning balance (in shares) at Sep. 30, 2021 |  | 31,294 |  |
Beginning balance at Sep. 30, 2021 | $ 724,884 | $ 31 | $ 866,158 | $ (141,305)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 133,881 |  |  | 133,881
Net comprehensive income | 133,881 |  |  | 133,881
Stock-based compensation expense | 6,515 |  | 6,515 |
Stock option exercises (in shares) |  | 1 |  |
Stock option exercises | 5 |  | 5 |
Shares issued under employee stock plans, net (in shares) |  | 518 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (55) |  |
Common stock redeemed for tax liability (in shares) |  | (308) |  |
Common stock redeemed for tax liability | (6,631) |  | (6,631) |
Share repurchases (in shares) |  | (175) |  |
Share repurchases | (2,527) |  | (2,527) |
Ending balance (in shares) at Jun. 30, 2022 |  | 31,275 |  |
Ending balance at Jun. 30, 2022 | 856,127 | $ 31 | 863,520 | (7,424)
Beginning balance (in shares) at Mar. 31, 2022 |  | 31,458 |  |
Beginning balance at Mar. 31, 2022 | 802,357 | $ 31 | 864,074 | (61,748)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 54,324 |  |  | 54,324
Net comprehensive income | 54,324 |  |  | 54,324
Stock-based compensation expense | 1,983 |  | 1,983 |
Stock option exercises | 1 |  | 1 |
Shares issued under employee stock plans, net (in shares) |  | 1 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (8) |  |
Common stock redeemed for tax liability (in shares) |  | (1) |  |
Common stock redeemed for tax liability | (11) |  | (11) |
Share repurchases (in shares) |  | (175) |  |
Share repurchases | (2,527) |  | (2,527) |
Ending balance (in shares) at Jun. 30, 2022 |  | 31,275 |  |
Ending balance at Jun. 30, 2022 | 856,127 | $ 31 | 863,520 | (7,424)
Beginning balance (in shares) at Sep. 30, 2022 |  | 30,880 |  |
Beginning balance at Sep. 30, 2022 | 939,286 | $ 31 | 859,856 | 79,399
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 102,855 |  |  | 102,855
Net comprehensive income | 102,855 |  |  | 102,855
Stock-based compensation expense | 5,247 |  | 5,247 |
Stock option exercises (in shares) |  | 2 |  |
Stock option exercises | 12 |  | 12 |
Shares issued under employee stock plans, net (in shares) |  | 675 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (12) |  |
Common stock redeemed for tax liability (in shares) |  | (206) |  |
Common stock redeemed for tax liability | (2,615) |  | (2,615) |
Ending balance (in shares) at Jun. 30, 2023 |  | 31,339 |  |
Ending balance at Jun. 30, 2023 | 1,044,785 | $ 31 | 862,500 | 182,254
Beginning balance (in shares) at Mar. 31, 2023 |  | 31,347 |  |
Beginning balance at Mar. 31, 2023 | 998,985 | $ 31 | 860,517 | 138,437
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 43,817 |  |  | 43,817
Net comprehensive income | 43,817 |  |  | 43,817
Stock-based compensation expense | 1,989 |  | 1,989 |
Stock option exercises (in shares) |  | 2 |  |
Stock option exercises | 12 |  | 12 |
Forfeiture and other settlements of restricted stock (in shares) |  | (9) |  |
Common stock redeemed for tax liability (in shares) |  | (1) |  |
Common stock redeemed for tax liability | (18) |  | (18) |
Ending balance (in shares) at Jun. 30, 2023 |  | 31,339 |  |
Ending balance at Jun. 30, 2023 | $ 1,044,785 | $ 31 | $ 862,500 | $ 182,254

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