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Stock Based Compensation (Restricted Stock Units) (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 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, 2010 Restricted Stock Units (RSUs) | Jun. 30, 2012 Restricted Stock | Dec. 31, 2011 Restricted Stock | Sep. 30, 2013 Restricted Stock | Sep. 30, 2012 Restricted Stock | Sep. 30, 2011 Restricted Stock | Sep. 30, 2013 Time Based Restricted Stock Unit Restricted Stock Units (RSUs) | Sep. 30, 2013 Performance Based Restricted Stock Unit Restricted Stock Units (RSUs) | Sep. 30, 2013 Performance Based Restricted Stock Unit Restricted Stock Units (RSUs) Minimum | Sep. 30, 2013 Performance Based Restricted Stock Unit Restricted Stock Units (RSUs) Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual amount of RSUs earned based on cumulative earnings |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |
Remaining Time based RSUs |  |  |  |  |  |  |  |  |  |  | 40.00% |  | 0.00% | 150.00%
Unvested restricted stock outstanding |  | 81,555 | 99,725 | 69,378 | 87,454 |  |  | 68,100 | 89,641 |  |  |  |  |
Performance cycle | 3 years |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Vesting period |  |  |  |  |  | 2 years | 3 years | 2 years |  |  | 3 years |  |  |
Compensation expense |  | $ 2.4 | $ 1.5 | $ 1.4 |  |  |  | $ 2.1 | $ 0.7 | $ 0.8 |  |  |  |
Amounts not yet recognized related to non-vested stock totaled |  | $ 2.1 | $ 1.9 |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life |  | 1 year 7 months 2 days |  |  |  |  |  | 1 year 5 months 5 days |  |  |  |  |  |

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- Definition Share based compensation arrangement by share based payment award remaining percent of actual amount of units earned. + References No definition available. + Details
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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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6793087&loc=d3e301413-122809 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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