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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation | 83,988 | 64,276 |  |
Tax withholding for share-based compensation | $ 1,000 | $ 600 |  |
Proceeds from stock option plan transactions | 662 | 2,972 | [1] |
Employee contributions | 289 | 380 | [1] |
Total intrinsic value of all options exercised | 300 | 400 |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost nonvested awards | $ 6,400 |  |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 3 years 1 month 6 days |  |  |
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost nonvested restricted stock units | $ 9,900 |  |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 2 years |  |  |
The 2018 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized |  |  |  | 1,500,000
Number of shares available for future grants | 297,885 |  |  |
The 2018 Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |
Expiration period | 7 years |  |  |
The Purchase Plan | The Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of continuous days of service | 90 days |  |  |
Number of hours per week employed | 20 hours |  |  |
Percent of market value | 85.00% |  |  |
Offering period | 3 months |  |  |
Employee contributions | $ 300 | $ 400 |  |
Common shares issued to employees | 33,706 | 45,718 |  |
Shares available for future issuance | 281,870 |  |  |
Director | The 2018 Plan | Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 1 year |  |  |
Executives and Employees | The 2018 Plan | Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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