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Stock-Based Compensation (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended | 0 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2014 Stock Options | Sep. 30, 2014 Restricted Stock Units | Sep. 30, 2014 The 2014 Plan | Jan. 27, 2014 The 2014 Plan | Sep. 30, 2014 The 2014 Plan Stock Options | Jan. 28, 2013 The 2013 Plan | Sep. 30, 2014 The 2013 Plan Stock Options | Jan. 25, 2010 The Omnibus Plan | Dec. 04, 2009 The Omnibus Plan | Sep. 30, 2014 The Stock Option Plan and Non-Officer Plan Stock Options | Jan. 27, 2014 The Purchase Plan | Sep. 30, 2014 The Purchase Plan | Sep. 30, 2013 The Purchase Plan | Sep. 30, 2012 The Purchase Plan | Jan. 27, 2014 The Purchase Plan | Sep. 30, 2014 Director [Member] The 2014 Plan Restricted Stock Units | Sep. 30, 2014 Director [Member] The 2013 Plan Restricted Stock Units | Sep. 30, 2014 Executive Officer [Member] The 2014 Plan Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  | 2,250,000 |  | 1,750,000 |  |  | 5,750,000 |  |  |  |  |  | 2,800,000 |  |  |
Expiration period |  |  |  |  |  |  |  | 8 years |  | 8 years |  |  | 10 years |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 4 years |  | 4 years |  |  | 4 years |  |  |  |  |  | 1 year | 1 year | 3 years
Number of shares available for future grants |  |  |  |  |  | 1,844,072 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional shares authorized |  |  |  |  |  |  |  |  |  |  | 2,500,000 |  |  | 800,000 |  |  |  |  |  |  |
Proceeds from stock option plan transactions | $ 3,689,000 | $ 2,193,000 | $ 1,072,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefits from stock-based compensation | (44,000) | (67,000) | (198,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 | 1,000,000 |  |  |  |
Common shares issued to employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,449 | 128,853 | 115,477 |  |  |  |
Shares available for future issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 741,378 |  |  |  |  |  |
Total intrinsic value of all options exercised | 500,000 | 500,000 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture rate | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost nonvested awards |  |  |  | 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total grant date fair value of shares vested | 800,000 | 3,100,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost, restricted stock units |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period, unrecognized compensation cost, nonvested awards |  |  |  | 2 years 3 months 21 days | 1 year 1 month 27 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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=6415400&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 No definition available. + 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=32706628&loc=d3e11374-113907 + 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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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