XML 68 R111.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Benefit Plans Asset Holdings (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014
Defined Benefit Plan Disclosure |  |
Target Allocation | 100.00% |
Plan Asset Allocations | 100.00% | 100.00%
Equity securities |  |
Defined Benefit Plan Disclosure |  |
New Policy Target Allocation | 47.00% |
Target Allocation | 32.00% |
Plan Asset Allocations | 38.00% | 43.00%
Private equity funds |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 10.00% |
Plan Asset Allocations | 5.00% | 5.00%
Low volatility global public equity [Member] |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 5.00% |
Plan Asset Allocations | 5.00% | 1.00%
Cash |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 2.00% |
Plan Asset Allocations | 2.00% | 2.00%
Core fixed income |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 5.00% |
Plan Asset Allocations | 5.00% | 5.00%
Long-term core fixed income |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 5.00% |
Plan Asset Allocations | 5.00% | 5.00%
Investment grade credit |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 6.00% |
Plan Asset Allocations | 6.00% | 6.00%
International emerging markets fixed income |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 5.00% |
Plan Asset Allocations | 5.00% | 5.00%
High yield fixed income |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 5.00% |
Plan Asset Allocations | 6.00% | 6.00%
Global TIPS |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 5.00% |
Plan Asset Allocations | 6.00% | 5.00%
Private real assets |  |
Defined Benefit Plan Disclosure |  |
New Policy Target Allocation | 10.00% |
Target Allocation | 10.00% |
Plan Asset Allocations | 9.00% | 7.00%
Commodities |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 5.00% |
Plan Asset Allocations | 4.00% | 4.00%
MLPs |  |
Defined Benefit Plan Disclosure |  |
Target Allocation | 5.00% |
Plan Asset Allocations | 4.00% | 6.00%
Fixed income |  |
Defined Benefit Plan Disclosure |  |
New Policy Target Allocation | 28.00% |
Public real assets |  |
Defined Benefit Plan Disclosure |  |
New Policy Target Allocation | 15.00% |

X
- Definition New policy target allocation of investments of this type to total plan assets presented on a weighted average basis. + References No definition available. + Details
Name: | tve_DefinedBenefitPlanNewPolicyTargetPlanAssetAllocations
Namespace Prefix: | tve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=tve_LowvolatilityglobalpublicequityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=tve_CoreFixedIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=tve_LongTermCoreFixedIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=tve_InvestmentGradeCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_ForeignCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=tve_HighYieldFixedIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=tve_GlobalTipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=tve_PrivateRealAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=tve_CommoditiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=tve_MlpsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=tve_PublicRealAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |