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Segment Information (Details)
 6 Months Ended
Mar. 31, 2015
segment
Segment Reporting Information  
Number of reportable segments (in segments) 2us-gaap_NumberOfReportableSegments
Electric Utility  
Segment Reporting Information  
Counties of operation, number 2ugu_CountiesofOperationNumber
/ us-gaap_StatementBusinessSegmentsAxis
= ugu_ElectricUtilityMember
Customer Concentration Risk | Revenue  
Segment Reporting Information  
Number of customers exceeding threshold 0ugu_NumberofCustomersExceedingThreshold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember