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Share-Based Payments - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options exercised (in shares) | 0 |
Proceeds from the exercise of stock options | $ 0 | $ 14
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock awards unvested (in shares) | 25,157 |
2012 Equity Incentive Plan | Stock Compensation Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Term of plan | 10 years |
Maximum number of shares available for grants or awards (in shares) | 2,500,000 |
Shares reserved for future issuance under award plan (in shares) | 121,038 |
All Plans |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost | $ 5,474 | 6,097
Proceeds from the exercise of stock options |  | 14
Intrinsic value of options exercised |  | 9
All Plans | Employee Stock Option |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Future income tax benefit from compensation expense recognized |  | 3
All Plans | Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost on non-vested awards | $ 13,338 |
Weighted average period of recognition of unrecognized compensation cost on non-vested awards | 1 year 9 months 18 days |
All Plans | Restricted Stock | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period | 3 years |
All Plans | Restricted Stock | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period | 5 years |
All Plans | Before Fiscal 2013 | Restricted Stock | After 3 Years |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting increment | 50.00% |
Vesting period | 3 years |
All Plans | Before Fiscal 2013 | Restricted Stock | Attainment of Pre-Defined Levels of Appreciation in Market Value |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting increment | 16.66% |
Retirement Eligible Employees |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost | $ 2,850 | 3,337
Future income tax benefit from compensation expense recognized | $ 1,341 | $ 2,378
2014 Director Fee Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Maximum number of shares available for grants or awards (in shares) | 150,000 |
Annual retainer fee paid to non-employee directors | $ 85 |
Annual retainer fee paid to non-employee Chairman of the Board | $ 185 |
Director Fee Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options outstanding (in shares) | 0 |
Shares deferred under stock based compensation plan (in shares) | 16,139 |
Value of annual stock based grant | $ 125 |
Total stock options granted to date (in shares) | 22,300 |
Total restricted stock awards granted to date (in shares) | 161,724 |
Restricted stock awards unvested (in shares) | 58,574 |

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- Definition The term of the identified stock based compensation plan in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Total stock options awards granted to date under the stock based compensation plan. + References No definition available. + Details
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- Definition Total restricted stock awards granted to date under the stock based compensation plan. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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