Subsequent Events (Details) (USD $)	1 Months Ended		3 Months Ended	0 Months Ended	3 Months Ended
	Aug. 31, 2013 Tennessee Regulatory Authority [Member] Integrity Management Rider [Member]	Feb. 28, 2014 Subsequent Event [Member] Tennessee Regulatory Authority [Member] Amortization And Refund For Excess Deferred Taxes [Member]	Jan. 31, 2014 Subsequent Event [Member] Tennessee Regulatory Authority [Member] Amortization And Refund For Excess Deferred Taxes [Member]	Feb. 05, 2014 Subsequent Event [Member] NCUC [Member] Integrity Management Rider [Member]	Jan. 31, 2014 Subsequent Event [Member] NCUC [Member] Integrity Management Rider [Member]
Public Utilities Rate Matters Requested [Abstract]
Public Utilities Requested Rate Increase (Decrease) Amount	$ 13,100,000	$ (4,700,000)
Public Utilities Rate Matters Approved [Abstract]
Public Utilities Approved Rate Increase (Decrease) Amount				$ 800,000
Public Utilities Disclosure Of Rate Matters			In February 2014, we filed a petition with the TRA to authorize us to amortize and refund $4.7 million to customers for recorded excess deferred taxes. We proposed to refund this amount to customers over three years. We are waiting on a ruling from the TRA at this time.		In January 2014, we filed a petition with the NCUC seeking authority to adjust rates effective February 1, 2014 under the IMR mechanism approved in the general rate case settlement agreement in December 2013 discussed above. The IMR provides for annual adjustments to our rates every February 1 for capital investments in integrity and safety projects as of October 31 of the preceding year. On February 5, 2014, the NCUC approved as filed an IMR adjustment totaling $.8 million in annual margin revenues to be reflected in our rates to customers.