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Long-Term Debt (Bank Credit Facility) (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended						12 Months Ended	15 Months Ended
	Sep. 30, 2011	Oct. 21, 2010	Jun. 30, 2011 Principal Payment Through December 31, 2013 [Member] Bank Credit Facility [Member]	Jun. 30, 2011 Principal Payment From January 1, 2014 Through September30, 2015 [Member] Bank Credit Facility [Member]	Oct. 21, 2010 Revolving Facility [Member] Bank Credit Facility [Member]	Oct. 21, 2010 Term Loan [Member] Bank Credit Facility [Member]	Oct. 21, 2010 Same-Day Swing Line Loan [Member] Bank Credit Facility [Member]	Oct. 21, 2010 Stand-By Letters of Credit [Member] Bank Credit Facility [Member]	Jun. 30, 2011 Bank Credit Facility [Member]	Sep. 30, 2011 Bank Credit Facility [Member]	Oct. 21, 2010 Bank Credit Facility [Member]
Debt Instrument [Line Items]
Bank credit facility- Revolving Facility	$ 125,000,000
Stand-by letters of credit		0
Credit facility maximum borrowings capacity					600,000,000	150,000,000	50,000,000	25,000,000		1,500,000	750,000,000
Revolving facility expiration date									October 21, 2015
Term loan period	4								5
Term loan principal payment			1,900,000	3,800,000
Term loan maximum additional borrowing capacity									200,000,000
Outstanding borrowings under the credit facility, percentage										2.24%
Debt issuance cost capitalized										6,000,000
Unamortized balance included in other assets										$ 4,600,000

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Debt issuance cost capitalized

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount borrowed under the credit facility as of the balance sheet date.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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Increase for additional borrowings on the credit facility during the period.

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The effective interest rate during the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of the required periodic payment applied to principal.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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