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Stock Based Compensation (Restricted Stock Units) (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 |  | 3 Months Ended | 12 Months Ended
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Sep. 30, 2012 Time Based Restricted Stock Unit [Member] | Oct. 31, 2010 Additional Restricted Stock Units [Member] | Sep. 30, 2012 Restricted Stock [Member] | Sep. 30, 2011 Restricted Stock [Member] | Sep. 30, 2010 Restricted Stock [Member] | Oct. 31, 2010 Restricted Stock Units (RSUs) [Member] | Oct. 31, 2009 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2012 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2011 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2010 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2009 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2011 Restricted Stock Units (RSUs) [Member] Time Based Restricted Stock Unit [Member] | Dec. 31, 2011 Restricted Stock Units (RSUs) [Member] Performance Based Restricted Stock Unit [Member] | Sep. 30, 2012 Restricted Stock Units (RSUs) [Member] Performance Based Restricted Stock Unit [Member] | Sep. 30, 2012 Restricted Stock Units (RSUs) [Member] Maximum [Member] Performance Based Restricted Stock Unit [Member] | Sep. 30, 2012 Restricted Stock Units (RSUs) [Member] Minimum [Member] Performance Based Restricted Stock Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual amount of RSUs earned based on cumulative earnings |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |
Target RSUs granted range |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150.00% | 0.00%
Remaining Time based RSUs | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage per year |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Units outstanding |  |  |  |  |  |  |  | 99,725 | 69,378 | 87,454 | 94,589 |  |  |  |  |
Performance cycle |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years |  |
Vesting period | 3 years |  | 2 years |  |  |  |  | 3 years |  |  |  | 3 years | 3 years |  |  |
Shares granted during period |  | 4,482 |  |  |  | 34,566 | 34,700 | 54,825 | 39,048 | 34,688 |  | 21,931 | 32,894 |  |  |
Weighted average grant date fair value |  | $ 32.12 |  |  |  | $ 30.79 | $ 38.36 | $ 38.71 |  |  |  | $ 31.18 | $ 31.18 |  |  |
Compensation expense |  |  | $ 0.7 | $ 0.8 | $ 0.8 |  |  | $ 1.5 | $ (1.4) | $ 1.3 |  |  |  |  |  |

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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 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: 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 6: 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 + Details
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