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Stock-based Compensation Plans (Tables) | 12 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Stock-based Compensation Expenses | Stock-based compensation expense was reported as follows on the consolidated statements of operations:
| Fiscal Year |
(In thousands) | 2023 |  |  | 2022 |  |  | 2021 |
Product costs | $ | 279 |  |  | $ | 234 |  |  | $ | 122 |
Research and development |  | 1,417 |  |  |  | 1,424 |  |  |  | 1,298 |
Selling, general and administrative |  | 5,909 |  |  |  | 5,399 |  |  |  | 4,443 |
Total stock-based compensation expense | $ | 7,605 |  |  | $ | 7,057 |  |  | $ | 5,863 |
Stock Option Fair Value Assumptions and Weighted Average Grant Date Fair Value of Stock Options Granted | stock option fair value assumptions and the weighted average grant date fair value of stock options granted were as follows:
| Fiscal Year |
| 2023 |  |  | 2022 |  |  | 2021 |
Stock option fair value assumptions: |  |  |  |  |  |  |  |
Risk-free interest rate |  | 3.76 | % |  |  | 1.49 | % |  |  | 0.40 | %
Expected life (years) | 4.7 |  |  | 4.6 |  |  | 4.6 |
Expected volatility |  | 45 | % |  |  | 43 | % |  |  | 43 | %
Dividend yield |  | — | % |  |  | — | % |  |  | — | %
Weighted average grant date fair value of stock options granted | $ | 15.03 |  |  | $ | 15.96 |  |  | $ | 14.71 |
Schedule of Stock Option Activity | Stock option activity was as follows:
(In thousands, except per share data) | Number of Shares |  |  | Weighted Average Exercise Price |
Options outstanding at September 30, 2020 |  | 940 |  |  | $ | 35.18 |
Granted |  | 274 |  |  |  | 40.95 |
Exercised |  | (248 | ) |  |  | 24.22 |
Forfeited and expired |  | (44 | ) |  |  | 44.58 |
Options outstanding at September 30, 2021 |  | 922 |  |  |  | 39.39 |
Granted |  | 342 |  |  |  | 42.10 |
Exercised |  | (45 | ) |  |  | 21.24 |
Forfeited and expired |  | (58 | ) |  |  | 43.99 |
Options outstanding at September 30, 2022 |  | 1,161 |  |  |  | 40.66 |
Granted |  | 311 |  |  |  | 34.73 |
Exercised |  | (20 | ) |  |  | 21.50 |
Forfeited and expired |  | (90 | ) |  |  | 41.77 |
Options outstanding at September 30, 2023 |  | 1,362 |  |  |  | 39.52 |
Options vested and exercisable at September 30, 2023 |  | 724 |  |  | $ | 40.47 |
Schedule of Restricted Stock Activity | Restricted Stock activity was as follows:
(In thousands, except per share data) | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested restricted stock awards at September 30, 2020 |  | 100 |  |  | $ | 44.16 |
Granted |  | 71 |  |  |  | 38.83 |
Vested |  | (48 | ) |  |  | 44.07 |
Forfeited |  | (4 | ) |  |  | 40.45 |
Unvested restricted stock awards at September 30, 2021 |  | 119 |  |  |  | 41.14 |
Granted |  | 99 |  |  |  | 42.35 |
Vested |  | (55 | ) |  |  | 42.98 |
Forfeited |  | (5 | ) |  |  | 41.83 |
Unvested restricted stock awards at September 30, 2022 |  | 158 |  |  |  | 41.24 |
Granted |  | 103 |  |  |  | 35.75 |
Vested |  | (69 | ) |  |  | 40.96 |
Forfeited |  | (19 | ) |  |  | 39.31 |
Unvested restricted stock awards at September 30, 2023 |  | 173 |  |  | $ | 38.30 |

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