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Summary Of Significant Accounting Policies (Details) (USD $)
3 Months Ended
Jan. 31, 2015
Oct. 31, 2014
Regulatory Asset [Line Items]    
Regulatory assets - current $ 12,595,000us-gaap_RegulatoryAssetsCurrent $ 29,088,000us-gaap_RegulatoryAssetsCurrent
Regulatory assets - noncurrent 184,092,000us-gaap_RegulatoryAssetsNoncurrent 184,779,000us-gaap_RegulatoryAssetsNoncurrent
Regulatory assets, Total 196,687,000us-gaap_RegulatoryAssets 213,867,000us-gaap_RegulatoryAssets
Regulatory Liabilities [Line Items]    
Regulatory liabilities - current 77,402,000us-gaap_RegulatoryLiabilityCurrent 46,231,000us-gaap_RegulatoryLiabilityCurrent
Regulatory liabilities - noncurrent 568,163,000us-gaap_RegulatoryLiabilityNoncurrent 558,598,000us-gaap_RegulatoryLiabilityNoncurrent
Regulatory liabilities, Total 645,565,000us-gaap_RegulatoryLiabilities 604,829,000us-gaap_RegulatoryLiabilities
Amount Due To Customers [Member]    
Regulatory Liabilities [Line Items]    
Regulatory liabilities - current 77,402,000us-gaap_RegulatoryLiabilityCurrent
/ us-gaap_RegulatoryLiabilityAxis
= pny_AmountDueToCustomersMember
46,231,000us-gaap_RegulatoryLiabilityCurrent
/ us-gaap_RegulatoryLiabilityAxis
= pny_AmountDueToCustomersMember
Regulatory Cost of Removal [Member]    
Regulatory Liabilities [Line Items]    
Regulatory liabilities - noncurrent 510,940,000us-gaap_RegulatoryLiabilityNoncurrent
/ us-gaap_RegulatoryLiabilityAxis
= us-gaap_AssetRetirementObligationCostsMember
506,574,000us-gaap_RegulatoryLiabilityNoncurrent
/ us-gaap_RegulatoryLiabilityAxis
= us-gaap_AssetRetirementObligationCostsMember
Deferred Income Taxes [Member]    
Regulatory Liabilities [Line Items]    
Regulatory liabilities - noncurrent 57,131,000us-gaap_RegulatoryLiabilityNoncurrent
/ us-gaap_RegulatoryLiabilityAxis
= us-gaap_DeferredIncomeTaxChargesMember
51,930,000us-gaap_RegulatoryLiabilityNoncurrent
/ us-gaap_RegulatoryLiabilityAxis
= us-gaap_DeferredIncomeTaxChargesMember
Amounts Not Yet Recognized As Component Of Pension and Other Post Retirement Benefit Costs [Member]    
Regulatory Liabilities [Line Items]    
Regulatory liabilities - noncurrent 92,000us-gaap_RegulatoryLiabilityNoncurrent
/ us-gaap_RegulatoryLiabilityAxis
= pny_AmountsNotYetRecognizedAsComponentOfPensionAndOtherPostRetirementBenefitCostsMember
94,000us-gaap_RegulatoryLiabilityNoncurrent
/ us-gaap_RegulatoryLiabilityAxis
= pny_AmountsNotYetRecognizedAsComponentOfPensionAndOtherPostRetirementBenefitCostsMember
Unamortized Debt Expense [Member]    
Regulatory Asset [Line Items]    
Regulatory assets - current 1,516,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_UnamortizedDebtExpenseMember
1,490,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_UnamortizedDebtExpenseMember
Regulatory assets - noncurrent 15,004,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_UnamortizedDebtExpenseMember
15,402,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_UnamortizedDebtExpenseMember
Amounts Due From Customers [Member]    
Regulatory Asset [Line Items]    
Regulatory assets - current 338,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_AmountsDueFromCustomersMember
16,108,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_AmountsDueFromCustomersMember
Environmental Costs [Member]    
Regulatory Asset [Line Items]    
Regulatory assets - current 1,554,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_EnvironmentalRestorationCostsMember
1,568,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_EnvironmentalRestorationCostsMember
Regulatory assets - noncurrent 6,091,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_EnvironmentalRestorationCostsMember
6,470,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_EnvironmentalRestorationCostsMember
Deferred Operations And Maintenance Expenses [Member]    
Regulatory Asset [Line Items]    
Regulatory assets - current 916,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredOperationsAndMaintenanceExpensesMember
916,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredOperationsAndMaintenanceExpensesMember
Regulatory assets - noncurrent 4,528,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredOperationsAndMaintenanceExpensesMember
4,721,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredOperationsAndMaintenanceExpensesMember
Deferred Pipeline Integrity Expenses [Member]    
Regulatory Asset [Line Items]    
Regulatory assets - current 3,470,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredPipelineIntegrityExpensesMember
3,470,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredPipelineIntegrityExpensesMember
Regulatory assets - noncurrent 25,407,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredPipelineIntegrityExpensesMember
24,694,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredPipelineIntegrityExpensesMember
Deferred Pension and Other Retirement Benefit Costs [Member]    
Regulatory Asset [Line Items]    
Regulatory assets - current 2,757,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredPensionAndOtherRetirementBenefitCostsMember
2,769,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredPensionAndOtherRetirementBenefitCostsMember
Regulatory assets - noncurrent 19,929,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredPensionAndOtherRetirementBenefitCostsMember
18,799,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_DeferredPensionAndOtherRetirementBenefitCostsMember
Amounts Not Yet Recognized As Component Of Pension and Other Post Retirement Benefit Costs [Member]    
Regulatory Asset [Line Items]    
Regulatory assets - noncurrent 92,676,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_AmountsNotYetRecognizedAsComponentOfPensionAndOtherPostRetirementBenefitCostsMember
94,265,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_AmountsNotYetRecognizedAsComponentOfPensionAndOtherPostRetirementBenefitCostsMember
Regulatory Cost of Removal [Member]    
Regulatory Asset [Line Items]    
Regulatory assets - noncurrent 18,509,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_AssetRetirementObligationCostsMember
18,275,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_AssetRetirementObligationCostsMember
Robeson LNG Development Cost [Member]    
Regulatory Asset [Line Items]    
Regulatory assets - current 783,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_RobesonLngDevelopmentCostMember
917,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= pny_RobesonLngDevelopmentCostMember
Regulatory assets - noncurrent 413,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_RobesonLngDevelopmentCostMember
509,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= pny_RobesonLngDevelopmentCostMember
Other [Member]    
Regulatory Asset [Line Items]    
Regulatory assets - current 1,261,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_OtherRegulatoryAssetsLiabilitiesMember
1,850,000us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_OtherRegulatoryAssetsLiabilitiesMember
Regulatory assets - noncurrent 1,535,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_OtherRegulatoryAssetsLiabilitiesMember
1,644,000us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_OtherRegulatoryAssetsLiabilitiesMember
Accounting Standards Update 2013-11 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= pny_AccountingStandardsUpdate201311Member