| **Variable Interest Entities (Details) (Variable Interest Entity, Not Primary Beneficiary [Member], USD $)In Thousands, unless otherwise specified** | Jan. 31, 2015                                                                                                                                                                                                                                                                                                 | Oct. 31, 2014                                                                                                                                                                                                                                                                                                 |
|------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Variable Interest Entity [Line Items]**                                                                                                            |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| Total equity method investments in non-utility activities                                                                                            | $ 184,478us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets                                                                                                                                                                                                                                    | $ 170,171us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets                                                                                                                                                                                                                                    |
| Cardinal Pipeline Company [Member]                                                                                                                   |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| **Variable Interest Entity [Line Items]**                                                                                                            |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| Total equity method investments in non-utility activities                                                                                            | 15,828us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_CardinalPipelineCompanyMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember     | 16,073us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_CardinalPipelineCompanyMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember     |
| Pine Needle Company [Member]                                                                                                                         |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| **Variable Interest Entity [Line Items]**                                                                                                            |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| Total equity method investments in non-utility activities                                                                                            | 18,228us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_PineNeedleCompanyMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember           | 18,689us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_PineNeedleCompanyMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember           |
| South Star Energy Services [Member]                                                                                                                  |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| **Variable Interest Entity [Line Items]**                                                                                                            |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| Total equity method investments in non-utility activities                                                                                            | 44,080us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_SouthStarEnergyServicesMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember     | 40,965us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_SouthStarEnergyServicesMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember     |
| Hardy Storage [Member]                                                                                                                               |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| **Variable Interest Entity [Line Items]**                                                                                                            |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| Total equity method investments in non-utility activities                                                                                            | 37,925us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_HardyStorageMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember                | 37,179us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_HardyStorageMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember                |
| Constitution Pipeline Company [Member]                                                                                                               |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| **Variable Interest Entity [Line Items]**                                                                                                            |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| Total equity method investments in non-utility activities                                                                                            | 63,489us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_ConstitutionPipelineCompanyMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | 57,255us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_ConstitutionPipelineCompanyMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember |
| Atlantic Coast Pipeline [Member]                                                                                                                     |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| **Variable Interest Entity [Line Items]**                                                                                                            |                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                          |
| Total equity method investments in non-utility activities                                                                                            | $ 4,928us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_AtlanticCoastPipelineMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember      | $ 10us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_AtlanticCoastPipelineMember/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember         |

| X                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_VariableInterestEntityLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685
+ Details**Name:**us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |