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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Beginning balance (in shares) at Sep. 30, 2019 |  | 30,933,000 |  |
Beginning balance at Sep. 30, 2019 | $ 538,754 | $ 31 | $ 854,275 | $ (315,552)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 28,548 |  |  | 28,548
Net comprehensive income | 28,548 |  |  | 28,548
Stock-based compensation expense | 4,869 |  | 4,869 |
Exercises of stock options (in shares) |  | 50,000 |  |
Exercises of stock options | 204 |  | 204 |
Shares issued under employee stock plans, net (in shares) |  | 588,000 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (17,000) |  |
Forfeiture and other settlements of restricted stock | (2,058) |  | (2,058) |
Common stock redeemed for tax liability (in shares) |  | (172,000) |  |
Common stock redeemed for tax liability | (2,674) |  | (2,674) |
Share repurchases (in shares) |  | (362,000) |  |
Share repurchases | (3,327) | $ 0 | (3,327) |
Ending balance (in shares) at Jun. 30, 2020 |  | 31,020,000 |  |
Ending balance at Jun. 30, 2020 | 564,316 | $ 31 | 851,289 | (287,004)
Beginning balance (in shares) at Sep. 30, 2019 |  | 30,933,000 |  |
Beginning balance at Sep. 30, 2019 | 538,754 | $ 31 | 854,275 | (315,552)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Share repurchases | (3,300) |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 31,012,000 |  |
Ending balance at Sep. 30, 2020 | 593,171 | $ 31 | 856,466 | (263,326)
Beginning balance (in shares) at Mar. 31, 2020 |  | 31,020,000 |  |
Beginning balance at Mar. 31, 2020 | 547,482 | $ 31 | 849,643 | (302,192)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 15,188 |  |  | 15,188
Net comprehensive income | 15,188 |  |  | 15,188
Stock-based compensation expense | 1,659 |  | 1,659 |
Shares issued under employee stock plans, net (in shares) |  | 7,000 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (6,000) |  |
Common stock redeemed for tax liability (in shares) |  | (1,000) |  |
Common stock redeemed for tax liability | (13) |  | (13) |
Ending balance (in shares) at Jun. 30, 2020 |  | 31,020,000 |  |
Ending balance at Jun. 30, 2020 | 564,316 | $ 31 | 851,289 | (287,004)
Beginning balance (in shares) at Sep. 30, 2020 |  | 31,012,000 |  |
Beginning balance at Sep. 30, 2020 | 593,171 | $ 31 | 856,466 | (263,326)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 73,660 |  |  | 73,660
Net comprehensive income | 73,660 |  |  | 73,660
Stock-based compensation expense | 9,254 |  | 9,254 |
Exercises of stock options (in shares) |  | 198,000 |  |
Exercises of stock options | 564 |  | 564 |
Shares issued under employee stock plans, net (in shares) |  | 417,000 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (29,000) |  |
Forfeiture and other settlements of restricted stock | 0 |  | 0 |
Common stock redeemed for tax liability (in shares) |  | (304,000) |  |
Common stock redeemed for tax liability | $ (3,044) |  | (3,044) |
Share repurchases (in shares) | 0 |  |  |
Ending balance (in shares) at Jun. 30, 2021 |  | 31,294,000 |  |
Ending balance at Jun. 30, 2021 | $ 673,605 | $ 31 | 863,240 | (189,666)
Beginning balance (in shares) at Mar. 31, 2021 |  | 31,289,000 |  |
Beginning balance at Mar. 31, 2021 | 633,767 | $ 31 | 860,537 | (226,801)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 37,135 |  |  | 37,135
Net comprehensive income | 37,135 |  |  | 37,135
Stock-based compensation expense | 3,194 |  | 3,194 |
Exercises of stock options (in shares) |  | 30,000 |  |
Exercises of stock options | (67) |  | (67) |
Shares issued under employee stock plans, net (in shares) |  | 6,000 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (13,000) |  |
Forfeiture and other settlements of restricted stock | 0 |  | 0 |
Common stock redeemed for tax liability (in shares) |  | (18,000) |  |
Common stock redeemed for tax liability | $ (424) |  | (424) |
Share repurchases (in shares) | 0 |  |  |
Ending balance (in shares) at Jun. 30, 2021 |  | 31,294,000 |  |
Ending balance at Jun. 30, 2021 | $ 673,605 | $ 31 | $ 863,240 | $ (189,666)

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