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Stock-based Compensation Plans (Tables) | 12 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-based Compensation Expenses | Stock-based compensation expense was reported as follows on the consolidated statements of operations:
|  | Fiscal Year |
(In thousands) |  | 2021 |  |  | 2020 |  |  | 2019 |
Product costs |  | $ | 122 |  |  | $ | 119 |  |  | $ | 135 |
Research and development |  |  | 1,298 |  |  |  | 896 |  |  |  | 876 |
Selling, general and administrative |  |  | 4,443 |  |  |  | 4,438 |  |  |  | 4,066 |
Total stock-based compensation expense |  | $ | 5,863 |  |  | $ | 5,453 |  |  | $ | 5,077 |
Stock Option Fair Value Assumptions and Weighted Average Fair Value of Stock Options Granted | Stock option fair value assumptions and the weighted average fair value of stock options granted were as follows:
|  | Fiscal Year |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Stock option fair value assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rates |  |  | 0.40 | % |  |  | 1.41 | % |  |  | 2.75 | %
Expected life (years) |  | 4.6 |  |  | 4.6 |  |  | 4.5 |
Expected volatility |  |  | 43 | % |  |  | 39 | % |  |  | 34 | %
Dividend yield |  |  | — | % |  |  | — | % |  |  | — | %
Weighted average grant date fair value of stock options granted |  | $ | 14.71 |  |  | $ | 14.13 |  |  | $ | 17.89 |
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, 2018 |  |  | 711 |  |  | $ | 26.28 |
Granted |  |  | 179 |  |  |  | 55.09 |
Exercised |  |  | (13 | ) |  |  | 22.03 |
Forfeited and expired |  |  | (6 | ) |  |  | 42.28 |
Options outstanding at September 30, 2019 |  |  | 871 |  |  |  | 32.18 |
Granted |  |  | 299 |  |  |  | 41.06 |
Exercised |  |  | (125 | ) |  |  | 22.89 |
Forfeited and expired |  |  | (105 | ) |  |  | 41.69 |
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 |
Options vested and exercisable at September 30, 2021 |  |  | 402 |  |  | $ | 36.07 |
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, 2018 |  |  | 85 |  |  | $ | 30.30 |
Granted |  |  | 45 |  |  |  | 56.05 |
Vested |  |  | (39 | ) |  |  | 28.61 |
Forfeited |  |  | (1 | ) |  |  | 47.86 |
Unvested restricted stock awards at September 30, 2019 |  |  | 90 |  |  |  | 43.69 |
Granted |  |  | 67 |  |  |  | 41.40 |
Vested |  |  | (43 | ) |  |  | 38.74 |
Forfeited |  |  | (14 | ) |  |  | 44.76 |
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 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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