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Stock-Based Compensation - Narrative (Details) shares in Thousands, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 25, 2003 shares | Sep. 30, 2020 USD ($) plan shares | Sep. 30, 2019 shares | Dec. 22, 2003 shares | Apr. 01, 2002 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of stock-based compensation plans | plan |  | 2 |  |  |
Granted (in shares) |  | 0 | 210 |  |
RSU |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period, condition one |  | 1 year |  |  |
Unrecognized stock compensation expense | $ |  | $ 1.8 |  |  |
Unrecognized stock compensation expense, period for recognition |  | 2 years 4 months 24 days |  |  |
RSU | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
RSU | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 4 years |  |  |
PSU |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized stock compensation expense | $ |  | $ 1.6 |  |  |
Unrecognized stock compensation expense, period for recognition |  | 1 year 4 months 24 days |  |  |
PSU | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Measurement period, percentage |  | 0.00% |  |  |
PSU | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Measurement period, percentage |  | 150.00% |  |  |
2002 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Issuance of options to purchase shares of common stock (in shares) |  |  |  |  | 700
Number of additional shares authorized for issuance under an established share-based compensation plan (in shares) | 100 |  |  |  |
2003 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Issuance of options to purchase shares of common stock (in shares) |  |  |  | 6,300 |
Common stock reserved for issuance (in shares) |  | 2,200 |  |  |
Available for future grant (in shares) |  | 1,300 |  |  |
2003 Plan | Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period, condition one |  | 1 year |  |  |
Expiration period, condition two |  | 90 days |  |  |
2003 Plan | Stock Option | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration date |  | 7 years |  |  |
2003 Plan | Stock Option | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration date |  | 10 years |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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