Summary Of Significant Accounting Policies (Details) (USD $)	Apr. 30, 2014	Oct. 31, 2013
Regulatory Asset [Line Items]
Regulatory assets - current	$ 25,459,000	$ 77,204,000
Regulatory assets - noncurrent	169,744,000	169,102,000
Regulatory assets, Total	195,203,000	246,306,000
Regulatory Liabilities [Line Items]
Regulatory liabilities - current	79,439,000	0
Regulatory liabilities - noncurrent	549,811,000	541,897,000
Regulatory liabilities, Total	629,250,000	541,897,000
Regulatory Cost of Removal [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities - noncurrent	501,672,000	493,111,000
Amount Due To Customers [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities - current	79,439,000	0
Deferred Income Taxes [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities - noncurrent	48,008,000	48,647,000
Amounts Not Yet Recognized As Component Of Pension and Other Post Retirement Benefit Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities - noncurrent	131,000	139,000
Unamortized Debt Expense [Member]
Regulatory Asset [Line Items]
Regulatory assets - current	1,384,000	1,274,000
Regulatory assets - noncurrent	13,832,000	14,149,000
Amounts Due From Customers [Member]
Regulatory Asset [Line Items]
Regulatory assets - current	14,414,000	66,321,000
Environmental Costs [Member]
Regulatory Asset [Line Items]
Regulatory assets - current	1,602,000	1,480,000
Regulatory assets - noncurrent	7,179,000	7,936,000
Deferred Operations And Maintenance Expenses [Member]
Regulatory Asset [Line Items]
Regulatory assets - current	916,000	739,000
Regulatory assets - noncurrent	5,099,000	5,637,000
Deferred Pipeline Integrity Expenses [Member]
Regulatory Asset [Line Items]
Regulatory assets - current	3,470,000	3,149,000
Regulatory assets - noncurrent	18,679,000	16,300,000
Deferred Pension and Other Retirement Benefit Costs [Member]
Regulatory Asset [Line Items]
Regulatory assets - current	2,769,000	2,768,000
Regulatory assets - noncurrent	20,177,000	17,968,000
Amounts Not Yet Recognized As Component Of Pension and Other Post Retirement Benefit Costs [Member]
Regulatory Asset [Line Items]
Regulatory assets - noncurrent	77,882,000	80,604,000
Regulatory Cost of Removal [Member]
Regulatory Asset [Line Items]
Regulatory assets - noncurrent	23,795,000	22,974,000
Robeson LNG Development Cost [Member]
Regulatory Asset [Line Items]
Regulatory assets - current	382,000	382,000
Regulatory assets - noncurrent	1,235,000	1,426,000
Other [Member]
Regulatory Asset [Line Items]
Regulatory assets - current	522,000	1,091,000
Regulatory assets - noncurrent	$ 1,866,000	$ 2,108,000