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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
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Sep. 30, 2014 2014 Equity Incentive Plan | Feb. 28, 2014 2014 Equity Incentive Plan | Sep. 30, 2014 2014 Non-Employee Director Equity Incentive Plan | Feb. 28, 2014 2014 Non-Employee Director Equity Incentive Plan | Jan. 31, 2013 Restricted Stock | Sep. 30, 2014 Restricted Stock | Sep. 30, 2013 Restricted Stock | Sep. 30, 2012 Restricted Stock | Aug. 31, 2012 Restricted Stock 2006 Plan | Jun. 30, 2012 Restricted Stock 2006 Plan | Feb. 28, 2014 Restricted Stock 2014 Non-Employee Director Equity Incentive Plan | Sep. 30, 2014 Restricted Stock Units (RSUs) | Sep. 30, 2013 Restricted Stock Units (RSUs) | Sep. 30, 2012 Restricted Stock Units (RSUs) | Sep. 30, 2011 Restricted Stock Units (RSUs) | Sep. 30, 2014 Restricted Stock Units (RSUs) 2006 Plan | Sep. 30, 2014 Restricted Stock Units (RSUs) Performance Based Restricted Stock Unit | Sep. 30, 2014 Restricted Stock Units (RSUs) Time Based Restricted Stock Unit | Sep. 30, 2014 Restricted Stock Units (RSUs) Time Based Restricted Stock Unit Minimum | Sep. 30, 2014 Restricted Stock Units (RSUs) Time Based Restricted Stock Unit Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, capital shares reserved for future issuance |  | 750,000 |  | 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the plan | 4,778 |  |  |  | 500 |  | 16,000 | 16,000 | 45,000 | 2,000 | 16,000 |  |  |  |  | 2,200 |  |  |  |
Number of shares available for grant | 745,222 |  | 134,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share |  |  |  |  | $ 42.54 |  | $ 58.54 | $ 37.50 | $ 39.11 | $ 37.50 | $ 66.15 |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 3 years | 2 years | 2 years | 3 years |  |  |  |  | 3 years | 3 years |  |
Restricted stock issuable to eligible Board of Directors members annually |  |  |  |  |  |  |  |  |  |  | 2,000 |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  | 60.00% |  |  |
Unvested restricted stock outstanding |  |  |  |  |  | 54,240 | 68,100 |  |  |  |  | 106,845 | 81,555 | 99,725 | 69,378 |  |  |  |  |
Compensation expense |  |  |  |  |  | $ 1.3 | $ 2.1 | $ 0.7 |  |  |  | $ 2.1 | $ 2.4 | $ 1.5 |  |  |  |  |  |
Target RSUs granted range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% | 0.00% | 150.00%
Amounts not yet recognized related to non-vested stock totaled |  |  |  |  |  |  |  |  |  |  |  | $ 2.4 | $ 2.1 |  |  |  |  |  |  |
Weighted average remaining contractual life |  |  |  |  |  | 10 months 13 days |  |  |  |  |  | 1 year 1 month 24 days |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -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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