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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 27, 2015 shares | Jan. 31, 2014 shares | Sep. 30, 2016 shares | Sep. 30, 2015 senior_executive $ / shares shares | Sep. 30, 2014 USD ($) shares | Dec. 31, 2013 shares | Feb. 28, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Treasury stock issued (in shares) |  | 152,403 | 35,478 | 16,755 | 176,564 |  |
Common shares (in shares) |  |  |  |  |  | 58,610 |
Employee stock options granted (in shares) |  |  | 0 | 0 | 0 |  |
Restricted Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation | $ |  |  |  |  | $ 195 |  |
Restricted Shares | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |
Restricted Shares | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 6 years |  |  |  |
2015 Plan | Restricted Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted shares of common stock awarded (in shares) |  |  |  | 12,500 |  |  |
Weighted average fair value (in dollars per share) | $ / shares |  |  |  | $ 49.49 |  |  |
2015 Plan | Common Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Additional common shares available for issuance (up to) (in shares) | 1,250,000 |  |  |  |  |  |
2015 Plan | Common Shares | Restricted Shares | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |
2015 Plan | Common Shares | Restricted Shares | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  | 5 years |  |  |
2015 Plan | Common Shares | Restricted Shares | Senior Executives |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of senior executives | senior_executive |  |  |  | 2 |  |  |
2013 Plan | Restricted Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares of common stock that were to be awarded to recipients (in shares) |  |  |  |  |  |  | 350,000

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