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Condensed Consolidated Balance Sheets (unaudited) (USD $)
Mar. 31, 2015
Sep. 30, 2014
Mar. 31, 2014
Current assets:      
Cash and cash equivalents $ 16,040,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 12,401,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 14,238,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 5,578,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 3,592,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Accounts receivable (less allowances for doubtful accounts of $11,889, $6,992 and $12,098, respectively) 183,046,000us-gaap_AccountsReceivableNetCurrent 65,080,000us-gaap_AccountsReceivableNetCurrent 181,823,000us-gaap_AccountsReceivableNetCurrent
Accounts receivable — related parties 2,709,000us-gaap_AccountsReceivableRelatedParties 2,865,000us-gaap_AccountsReceivableRelatedParties 8,633,000us-gaap_AccountsReceivableRelatedParties
Accrued utility revenues 42,056,000ugu_AccruedUtilityRevenues 14,330,000ugu_AccruedUtilityRevenues 49,710,000ugu_AccruedUtilityRevenues
Inventories 19,533,000us-gaap_InventoryNet 95,219,000us-gaap_InventoryNet 20,629,000us-gaap_InventoryNet
Deferred income taxes 25,168,000us-gaap_DeferredTaxAssetsNetCurrent 1,492,000us-gaap_DeferredTaxAssetsNetCurrent 12,877,000us-gaap_DeferredTaxAssetsNetCurrent
Regulatory assets 625,000us-gaap_DeferredFuelCost 13,159,000us-gaap_DeferredFuelCost 4,242,000us-gaap_DeferredFuelCost
Derivative instruments 612,000us-gaap_DerivativeInstrumentsAndHedges 1,028,000us-gaap_DerivativeInstrumentsAndHedges 3,221,000us-gaap_DerivativeInstrumentsAndHedges
Prepaid expenses & other current assets 15,648,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 18,535,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 13,705,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 311,015,000us-gaap_AssetsCurrent 227,701,000us-gaap_AssetsCurrent 309,078,000us-gaap_AssetsCurrent
Property, plant and equipment, at cost (less accumulated depreciation and amortization of $911,289, $886,268 and $877,460, respectively) 1,753,197,000us-gaap_PropertyPlantAndEquipmentNet 1,682,284,000us-gaap_PropertyPlantAndEquipmentNet 1,611,934,000us-gaap_PropertyPlantAndEquipmentNet
Goodwill 182,145,000us-gaap_Goodwill 182,145,000us-gaap_Goodwill 182,145,000us-gaap_Goodwill
Regulatory assets 251,945,000us-gaap_RegulatoryAssetsNoncurrent 255,007,000us-gaap_RegulatoryAssetsNoncurrent 231,689,000us-gaap_RegulatoryAssetsNoncurrent
Other assets 7,741,000us-gaap_OtherAssetsNoncurrent 7,506,000us-gaap_OtherAssetsNoncurrent 5,771,000us-gaap_OtherAssetsNoncurrent
Total assets 2,506,043,000us-gaap_Assets 2,354,643,000us-gaap_Assets 2,340,617,000us-gaap_Assets
Current liabilities:      
Current maturities of long-term debt 92,000,000us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 20,000,000us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 0us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Short-term borrowings 30,500,000us-gaap_ShortTermBankLoansAndNotesPayable 86,300,000us-gaap_ShortTermBankLoansAndNotesPayable 6,500,000us-gaap_ShortTermBankLoansAndNotesPayable
Accounts payable 54,612,000us-gaap_AccountsPayableCurrent 58,453,000us-gaap_AccountsPayableCurrent 69,468,000us-gaap_AccountsPayableCurrent
Accounts payable — related parties 14,979,000us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent 11,761,000us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent 20,715,000us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent
Deferred fuel refunds 40,542,000us-gaap_RegulatoryLiabilityCurrent 0us-gaap_RegulatoryLiabilityCurrent 3,204,000us-gaap_RegulatoryLiabilityCurrent
Derivative instruments 5,464,000us-gaap_DerivativeInstrumentsAndHedgesLiabilities 1,632,000us-gaap_DerivativeInstrumentsAndHedgesLiabilities 372,000us-gaap_DerivativeInstrumentsAndHedgesLiabilities
Other current liabilities 166,879,000us-gaap_OtherLiabilitiesCurrent 99,336,000us-gaap_OtherLiabilitiesCurrent 149,983,000us-gaap_OtherLiabilitiesCurrent
Total current liabilities 404,976,000us-gaap_LiabilitiesCurrent 277,482,000us-gaap_LiabilitiesCurrent 250,242,000us-gaap_LiabilitiesCurrent
Long-term debt 550,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations 622,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations 642,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations
Deferred income taxes 472,343,000us-gaap_DeferredTaxLiabilitiesNoncurrent 461,461,000us-gaap_DeferredTaxLiabilitiesNoncurrent 448,678,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred investment tax credits 3,765,000us-gaap_AccumulatedDeferredInvestmentTaxCredit 3,933,000us-gaap_AccumulatedDeferredInvestmentTaxCredit 4,100,000us-gaap_AccumulatedDeferredInvestmentTaxCredit
Pension and postretirement benefit obligations 94,332,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 98,363,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 65,972,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Derivative instruments 75,000us-gaap_DerivativeLiabilitiesNoncurrent 0us-gaap_DerivativeLiabilitiesNoncurrent 0us-gaap_DerivativeLiabilitiesNoncurrent
Other noncurrent liabilities 51,262,000us-gaap_OtherLiabilitiesNoncurrent 51,567,000us-gaap_OtherLiabilitiesNoncurrent 52,669,000us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 1,576,753,000us-gaap_Liabilities 1,514,806,000us-gaap_Liabilities 1,463,661,000us-gaap_Liabilities
Commitments and contingencies (Note 7)         
Common stockholder’s equity:      
Common Stock, $2.25 par value (authorized — 40,000,000 shares; issued and outstanding — 26,781,785 shares) 60,259,000us-gaap_CommonStockValue 60,259,000us-gaap_CommonStockValue 60,259,000us-gaap_CommonStockValue
Additional paid-in capital 471,653,000us-gaap_AdditionalPaidInCapitalCommonStock 471,071,000us-gaap_AdditionalPaidInCapitalCommonStock 470,761,000us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 404,516,000us-gaap_RetainedEarningsAccumulatedDeficit 316,688,000us-gaap_RetainedEarningsAccumulatedDeficit 353,680,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (7,138,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (8,181,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (7,744,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total common stockholder’s equity 929,290,000us-gaap_StockholdersEquity 839,837,000us-gaap_StockholdersEquity 876,956,000us-gaap_StockholdersEquity
Total liabilities and stockholder’s equity $ 2,506,043,000us-gaap_LiabilitiesAndStockholdersEquity $ 2,354,643,000us-gaap_LiabilitiesAndStockholdersEquity $ 2,340,617,000us-gaap_LiabilitiesAndStockholdersEquity