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Stock-Based Compensation (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 27, 2014 | Jan. 25, 2010 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013 | Jan. 28, 2013 | Dec. 04, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Proceeds from stock option plan transactions |  |  | $ 6,559 | $ 3,689 | $ 2,193 |  |
Excess tax benefits from stock-based compensation |  |  | 0 | (44) | (67) |  |
Total intrinsic value of all options exercised |  |  | $ 900 | 500 | 500 |  |
Forfeiture rate |  |  | 6.00% |  |  |  |
Total grant date fair value of shares vested |  |  | $ 2,900 | 800 | 3,100 |  |
Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total unrecognized compensation cost nonvested awards |  |  | $ 3,600 |  |  |  |
Weighted average period, unrecognized compensation cost, nonvested awards |  |  | 2 years 8 months 12 days |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average period, unrecognized compensation cost, nonvested awards |  |  | 1 year 5 months 1 day |  |  |  |
Total unrecognized compensation cost, restricted stock units |  |  | $ 3,200 |  |  |  |
The 2014 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized | 2,250,000 |  |  |  |  |  |
Number of shares available for future grants |  |  | 1,369,684 |  |  |  |
The 2014 Plan | Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period |  |  | 8 years |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
The 2013 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  | 1,750,000 |
The 2013 Plan | Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period |  |  | 8 years |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
The Omnibus Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  | 5,750,000
Number of additional shares authorized |  | 2,500,000 |  |  |  |  |
The Stock Option Plan and Non-Officer Plan | Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
The Purchase Plan | The Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized | 2,800,000 |  |  |  |  |  |
Number of additional shares authorized | 800,000 |  |  |  |  |  |
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 |  |  | $ 900 | $ 1,000 | $ 1,000 |  |
Common shares issued to employees |  |  | 123,847 | 129,449 | 128,853 |  |
Shares available for future issuance |  |  | 617,531 |  |  |  |
Director [Member] | The 2014 Plan | Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |
Director [Member] | The 2013 Plan | Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |
Executives and Employees [Member] | The 2014 Plan | Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |

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