Summary Of Significant Accounting Policies (Details) (USD $)	1 Months Ended	12 Months Ended
	Apr. 30, 2014	Oct. 31, 2014 segment	Oct. 31, 2013	Oct. 31, 2012	Dec. 31, 2013
Segment Reporting [Abstract]
Number of Reportable Segments		3
Regulatory Assets [Line Items]
Regulatory Assets, Current		$ 29,088,000	$ 77,204,000
Regulatory Assets, Noncurrent		184,779,000	169,102,000
Total Regulatory Assets		213,867,000	246,306,000
Other Regulatory Assets On Which We Do Not Earn a Return		98,100,000
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		46,231,000	0
Regulatory Liability, Noncurrent		558,598,000	541,897,000
Total Regulatory Liabilities		604,829,000	541,897,000
Public Utility, Property, Plant and Equipment [Line Items]
Plant held for future use		3,155,000	3,155,000
Intangible plant		3,374,000	3,374,000
Other storage plant		180,058,000	171,349,000
Transmission plant		1,787,990,000	1,403,829,000
Distribution plant		2,623,560,000	2,505,160,000
General plant		421,763,000	335,847,000
Asset retirement cost		11,000	7,565,000
Contributions in aid of construction		(5,259,000)	(5,187,000)
Total utility plant in service		5,011,497,000	4,421,937,000
Less accumulated depreciation		(1,166,922,000)	(1,088,331,000)
Utility plant in service, net		3,844,575,000	3,333,606,000
Construction work in progress		141,693,000	297,717,000
Plant held for future use		3,155,000	3,155,000
Total utility plant, net		3,989,423,000	3,634,478,000
Public Utilities, Property, Plant and Equipment, Amount of Loss (Recovery) on Plant Abandonment			1,800,000
Property, Plant and Equipment [Line Items]
Allowance for borrowed funds used during construction		16,427,000	30,975,000	25,211,000
Composite weighted-average depreciation rates		2.54%	2.77%	2.94%
Accounts, Notes, Loans and Financing Receivable, Net, Current [Abstract]
Gas receivables		64,400,000	78,540,000
Non-regulated merchandise and service work receivables		3,012,000	2,274,000
Allowance for doubtful accounts		(2,152,000)	(1,604,000)	(1,579,000)
Trade accounts receivable		65,260,000	79,210,000
Customers Payment Due Date		30 days
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year		1,604,000	1,579,000	1,347,000
Additions charged to uncollectibles expense		6,959,000	5,314,000	4,584,000
Accounts written off, net of recoveries		(6,411,000)	(5,289,000)	(4,352,000)
Balance at end of year		2,152,000	1,604,000	1,579,000
Inventory, Net [Abstract]
Natural Gas Inventories Not Available For Sale Held by Asset Manager		35,000,000	31,500,000
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Near Term Redemption		180 days
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Accumulated Impairment Loss		0
Goodwill, Impairment Loss		0	0	0
Asset Impairment Charges	2,000,000		0	0
Investment Measurement [Line Items]
Current trading securities (cost)		128,000	134,000
Noncurrent trading securities(cost)		3,045,000	2,375,000
Current trading securities		214,000	199,000
Noncurrent trading securities		3,727,000	2,995,000
Total trading securities		3,941,000	3,194,000
Total trading securities (cost)		3,173,000	2,509,000
Deferred Finance Costs [Abstract]
Long Term Debt Expense Amortization Period		5 to 30 years
Short Term Debt Expense Amortization Period		5 years
Asset Retirement Obligations [Line Items]
Regulatory non-legal AROs		506,574,000	493,111,000
Conditional cost of removal obligations		14,647,000	27,016,000
Total cost of removal obligations		521,221,000	520,127,000
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning of period		27,016,000	28,629,000
Liabilities incurred during the period		2,108,000	2,052,000
Liabilities settled during the period		(3,576,000)	(2,389,000)
Accretion		1,548,000	1,641,000
Adjustment to estimated cash flows		(12,449,000)	(2,917,000)
End of period		14,647,000	27,016,000	28,629,000
Weighted Average Risk Free Rate		5.09%
Money Market Funds [Member]
Investment Measurement [Line Items]
Current trading securities (cost)		22,000	0
Noncurrent trading securities(cost)		447,000	380,000
Current trading securities		22,000	0
Noncurrent trading securities		447,000	380,000
Total trading securities		469,000	380,000
Equity Funds [Member]
Investment Measurement [Line Items]
Current trading securities (cost)		106,000	134,000
Noncurrent trading securities(cost)		2,598,000	1,995,000
Current trading securities		192,000	199,000
Noncurrent trading securities		3,280,000	2,615,000
Total trading securities		3,472,000	2,814,000
Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		5 years
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Credit Adjusted Risk Free Rate		4.40%
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		80 years
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Credit Adjusted Risk Free Rate		5.15%
Land Costs [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Plant held for future use				3,200,000
Plant held for future use				3,200,000
Non-real Estate Costs [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Plant held for future use				3,500,000
Plant held for future use				3,500,000
Amount Due To Customers
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		46,231,000	0
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		506,574,000	493,111,000
Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		51,930,000	48,647,000
Amounts Not Yet Recognized As Component Of Pension and Other Post Retirement Benefit Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		94,000	139,000
NCUC [Member]
Property, Plant and Equipment [Line Items]
Depreciation Study Requirement		5 years
Unamortized debt expense
Regulatory Assets [Line Items]
Regulatory Assets, Current		1,490,000	1,274,000
Regulatory Assets, Noncurrent		15,402,000	14,149,000
Amounts due from customers
Regulatory Assets [Line Items]
Regulatory Assets, Current		16,108,000	66,321,000
Environmental costs
Regulatory Assets [Line Items]
Regulatory Assets, Current		1,568,000	1,480,000
Regulatory Assets, Noncurrent		6,470,000	7,936,000
Total Regulatory Assets		8,000,000
Environmental costs | PSCSC [Member] | Settlement With Office of Regulatory Staff October 2014 [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Current		100,000
Total Regulatory Assets		100,000
Amortization Time Period For Specified Expenses		1 year
Regulatory Noncurrent Asset, End Date for Recovery		Oct. 31, 2015
Deferred operations and maintenance expenses
Regulatory Assets [Line Items]
Regulatory Assets, Current		916,000	739,000
Regulatory Assets, Noncurrent		4,721,000	5,637,000
Deferred operations and maintenance expenses | NCUC [Member]
Regulatory Assets [Line Items]
Total Regulatory Assets		5,600,000	6,400,000
Deferred pipeline integrity expenses
Regulatory Assets [Line Items]
Regulatory Assets, Current		3,470,000	3,149,000
Regulatory Assets, Noncurrent		24,694,000	16,300,000
Deferred pipeline integrity expenses | NCUC [Member]
Regulatory Assets [Line Items]
Total Regulatory Assets		28,200,000	19,400,000
Deferred pension and other retirement benefits costs
Regulatory Assets [Line Items]
Regulatory Assets, Current		2,769,000	2,768,000
Regulatory Assets, Noncurrent		18,799,000	17,968,000
Amounts Not Yet Recognized As Component Of Pension and Other Post Retirement Benefit Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent		94,265,000	80,604,000
Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent		18,275,000	22,974,000
Amount Of Regulatory Costs Approved To Be Accrued Not Included In Rate Base		18,300,000
Robeson LNG Development Cost [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Current		917,000	382,000
Regulatory Assets, Noncurrent		509,000	1,426,000
Robeson LNG Development Cost [Member] | NCUC [Member] | General Rate Application Settlement 2013 [Member]
Regulatory Assets [Line Items]
Total Regulatory Assets					1,200,000
Amortization Time Period For Specified Expenses		38 months
Regulatory Noncurrent Asset, End Date for Recovery		Feb. 28, 2017
Robeson LNG Development Cost [Member] | PSCSC [Member] | Settlement With Office of Regulatory Staff October 2014 [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Current		500,000
Amortization Time Period For Specified Expenses		12 months
Regulatory Noncurrent Asset, End Date for Recovery		Oct. 31, 2015
Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Current		1,850,000	1,091,000
Regulatory Assets, Noncurrent		$ 1,644,000	$ 2,108,000