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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2011 years | Sep. 30, 2010 years | Sep. 30, 2009
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of goodwill and intangible assets | $ 0 |  |  |
Amortization expense related to intangible assets |  | 12.0 | 11.6 | 19.2
Expected remaining useful life |  | 17 | 10 |
Estimated intangible asset amortization for 2011 |  | 12.0 |  |
Estimated intangible asset amortization for 2012 |  | 12.0 |  |
Estimated intangible asset amortization for 2013 |  | 12.0 |  |
Estimated intangible asset amortization for 2014 |  | 12.0 |  |
Estimated intangible asset amortization for 2015 |  | 12.0 |  |
Estimated intangible asset amortization after 2015 |  | 10.5 |  |
Aclara PLS's TWACS NG Software [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization expense related to intangible assets |  | $ 4.7 | $ 4.5 | $ 12.2
Capitalized Software [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Estimated useful life of capitalized software, minimum |  | 3 |  |
Estimated useful life of capitalized software, maximum |  | 7 |  |
Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Expected remaining useful life |  | 20 |  |

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- Definition The useful life of all finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 12, 13, 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 35 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6904245&loc=d3e15372-109273 + Details
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