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Investment in Unconsolidated Affiliate Narrative (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Investment in Unconsolidated Affiliate [Abstract]              
Equity interest in investee's unrealized gains on hedging derivatives, net of taxes $ 6uti_Equityinterestininvesteesunrealizedgainsonhedgingderivativesnetoftaxes $ 0uti_Equityinterestininvesteesunrealizedgainsonhedgingderivativesnetoftaxes $ 17uti_Equityinterestininvesteesunrealizedgainsonhedgingderivativesnetoftaxes $ 0uti_Equityinterestininvesteesunrealizedgainsonhedgingderivativesnetoftaxes      
Investment in Unconsolidated Affiliate $ 3,946us-gaap_EquityMethodInvestments $ 4,208us-gaap_EquityMethodInvestments $ 3,946us-gaap_EquityMethodInvestments $ 4,208us-gaap_EquityMethodInvestments $ 3,903us-gaap_EquityMethodInvestments $ 4,000us-gaap_EquityMethodInvestments $ 4,000us-gaap_EquityMethodInvestments