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Stock-Based Compensation (Details) - USD ($) |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 25, 2010 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Jan. 30, 2017 | Feb. 01, 2016 | Jan. 27, 2014 | Jan. 28, 2013 | Dec. 04, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from employee stock purchase plan transactions |  | $ 685,000 | $ 896,000 | $ 925,000 |  |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation |  | 49,684 | 47,464 | 9,371 |  |  |  |  |
Adjustments Related to Tax Withholding for Share-based Compensation |  | $ 700,000 | $ 600,000 | $ 100,000 |  |  |  |  |
Proceeds from stock option plan transactions |  | 3,502,000 | 7,191,000 | 6,559,000 |  |  |  |  |
Excess tax benefits from stock-based compensation |  | 326,000 | 212,000 | 0 |  |  |  |  |
Total intrinsic value of all options exercised |  | $ 900,000 | 1,900,000 | 900,000 |  |  |  |  |
Forfeiture rate |  | 10.00% |  |  |  |  |  |  |
Total grant date fair value of shares vested |  | $ 2,400,000 | 2,900,000 |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost nonvested awards |  | $ 3,400,000 |  |  |  |  |  |  |
Weighted average period, unrecognized compensation cost, nonvested awards |  | 2 years 10 months 24 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 2 months 12 days |  |  |  |  |  |  |
Total unrecognized compensation cost, restricted stock units |  | $ 3,800,000 |  |  |  |  |  |  |
The 2017 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 |  | 1,583,578 |  |  |  |  |  |  |
The 2017 Plan | Stock Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expiration period |  | 7 years |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |
The 2016 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  | 1,500,000 |  |  |
The 2016 Plan | Stock Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expiration period |  | 7 years |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |
The 2014 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  | 2,250,000 |  |
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 Purchase Plan | The Purchase Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  | 2,800,000 |  |
Proceeds from employee stock purchase plan transactions |  | $ 700,000 | $ 900,000 | $ 900,000 |  |  |  |  |
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 |  |  |  |  |  |  |
Common shares issued to employees |  | 72,594 | 103,915 | 123,847 |  |  |  |  |
Shares available for future issuance |  | 441,022 |  |  |  |  |  |  |
Director | The 2017 Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  | 1 year |  |  |  |  |  |  |
Director | The 2016 Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  | 1 year |  |  |  |  |  |  |
Director | The 2014 Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  | 1 year |  |  |  |  |  |  |
Director | The 2013 Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  | 1 year |  |  |  |  |  |  |
Executives and Employees | The 2017 Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |
Executives and Employees | The 2016 Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |
Executives and Employees | 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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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