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Common Stock and Options - Narrative (Details) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Dec. 31, 2016 $ / shares shares | Sep. 30, 2015 shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 executive $ / shares shares | May 31, 2017 shares | Mar. 31, 2017 shares | Jan. 27, 2017 shares | Feb. 27, 2015 $ / shares | Sep. 30, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (up to) (in shares) | shares |  | 170,000 | 7,000,000 |  | 170,000 | 2,000,000 | 5,000,000 |  |  | 105,000
Employee stock options granted (in shares) | shares |  | 0 | 750,000 | 0 |  |  |  |  |  |
Shares issued (in dollars per share) | $ / shares | $ 27.15 |  |  |  |  |  |  |  |  |
Period of consecutive trading days | 20 days |  |  |  |  |  |  |  |  |
Period following an executive's termination of employment for a number of reasons | 18 months |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | $ 34.15 |  |  |  |  |  | $ 45.67 |
Restricted Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted shares of common stock awarded (in shares) | shares |  |  | 0 | 0 | 12,500 |  |  |  |  |
Weighted average fair value (in dollars per share) | $ / shares |  |  | $ 0.00 | $ 0.00 | $ 49.49 |  |  |  |  |
Total stock compensation expense | $ |  |  | $ 264,000 | $ 150,000 |  |  |  |  |  |
Unrecognized compensation costs | $ |  |  | 149,000 | 413,000 |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Total stock compensation expense | $ |  |  | 616,000 | $ 0 |  |  |  |  |  |
Unrecognized compensation costs | $ |  |  | $ 2,030,000 |  |  |  |  |  |  |
Employee stock options granted (in shares) | shares |  |  | 750,000 |  |  |  |  |  |  |
Weighted average grant date fair value of option grant (in dollars per share) | $ / shares |  |  | $ 3.53 |  |  |  |  |  |  |
Number of shares available for issuance (in shares) | shares |  |  | 750,000 | 0 |  |  |  |  |  |
The 2015 Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (up to) (in shares) | shares |  |  |  |  |  |  |  | 1,250,000 |  |
The 2015 Plan | Restricted Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted shares of common stock awarded (in shares) | shares |  |  |  |  | 12,500 |  |  |  |  |
Number of senior executives | executive |  |  |  |  | 2 |  |  |  |  |
Weighted average fair value (in dollars per share) | $ / shares |  |  |  |  | $ 49.49 |  |  |  |  |
The 2015 Plan | Employee Stock Option |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance (in shares) | shares |  |  | 487,500 |  |  |  |  |  |  |
Minimum | The 2015 Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 1 year |  |  |  |  |
Minimum | The 2015 Plan | Restricted Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | $ 34.45 |  |  |  |  |  |  |
Maximum | The 2015 Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 6 years |  |  |  |  |
Maximum | The 2015 Plan | Restricted Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 5 years |  |  |  |  |
Chief Executive Officer |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Employee stock options granted (in shares) | shares | 300,000 |  |  |  |  |  |  |  |  |
Board of Directors Chairman |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Employee stock options granted (in shares) | shares | 225,000 |  |  |  |  |  |  |  |  |
Tranche One |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of option price to vest | 25.00% |  |  |  |  |  |  |  |  |
Amount per share (in dollars per share) | $ / shares | $ 60.00 |  |  |  |  |  |  |  |  |
Tranche Two |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of option price to vest | 25.00% |  |  |  |  |  |  |  |  |
Amount per share (in dollars per share) | $ / shares | $ 75.00 |  |  |  |  |  |  |  |  |
Tranche Three |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of option price to vest | 25.00% |  |  |  |  |  |  |  |  |
Amount per share (in dollars per share) | $ / shares | $ 90.00 |  |  |  |  |  |  |  |  |
Tranche Four |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of option price to vest | 25.00% |  |  |  |  |  |  |  |  |
Amount per share (in dollars per share) | $ / shares | $ 105.00 |  |  |  |  |  |  |  |  |

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