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Investments (Amortized Cost and Fair Value of Held to Maturity Investments) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 58,202 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment | $ 57,163 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Gross Unrealized Gains | 25 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain | 28 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Gross Unrealized Losses | (30)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss | (37)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Estimated Fair Market Value | 58,197 us-gaap_HeldToMaturitySecuritiesFairValue | 57,154 us-gaap_HeldToMaturitySecuritiesFairValue
Municipal bonds, due in less than 1 year |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 25,291 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInLessThanOneYearMember | 26,894 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInLessThanOneYearMember
Gross Unrealized Gains | 15 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInLessThanOneYearMember | 20 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInLessThanOneYearMember
Gross Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInLessThanOneYearMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInLessThanOneYearMember
Estimated Fair Market Value | 25,306 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInLessThanOneYearMember | 26,914 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInLessThanOneYearMember
Corporate bonds, due in less than 1 year |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 19,488 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInLessThanOneYearMember | 16,836 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInLessThanOneYearMember
Gross Unrealized Gains | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInLessThanOneYearMember | 1 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInLessThanOneYearMember
Gross Unrealized Losses | (24)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInLessThanOneYearMember | (24)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInLessThanOneYearMember
Estimated Fair Market Value | 19,464 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInLessThanOneYearMember | 16,813 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInLessThanOneYearMember
Certificates of deposit, due in less than 1 year |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 4,129 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInLessThanOneYearMember | 2,176 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInLessThanOneYearMember
Gross Unrealized Gains | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInLessThanOneYearMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInLessThanOneYearMember
Gross Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInLessThanOneYearMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInLessThanOneYearMember
Estimated Fair Market Value | 4,129 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInLessThanOneYearMember | 2,176 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInLessThanOneYearMember
Municipal bonds, due in 1 - 2 years |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 5,389 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInOneToTwoYearsMember | 4,230 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInOneToTwoYearsMember
Gross Unrealized Gains | 10 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInOneToTwoYearsMember | 7 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInOneToTwoYearsMember
Gross Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInOneToTwoYearsMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInOneToTwoYearsMember
Estimated Fair Market Value | 5,399 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInOneToTwoYearsMember | 4,237 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_MunicipalBondsDueInOneToTwoYearsMember
Corporate bonds due In 1 - 2 years |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 2,818 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInOneToTwoYearsMember | 4,054 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInOneToTwoYearsMember
Gross Unrealized Gains | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInOneToTwoYearsMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInOneToTwoYearsMember
Gross Unrealized Losses | (6)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInOneToTwoYearsMember | (13)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInOneToTwoYearsMember
Estimated Fair Market Value | 2,812 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInOneToTwoYearsMember | 4,041 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_CorporateBondsDueInOneToTwoYearsMember
Certificates of deposit, due in 1- 2 years |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,087 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInOneToTwoYearsMember | 2,973 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInOneToTwoYearsMember
Gross Unrealized Gains | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInOneToTwoYearsMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInOneToTwoYearsMember
Gross Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInOneToTwoYearsMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInOneToTwoYearsMember
Estimated Fair Market Value | $ 1,087 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInOneToTwoYearsMember | $ 2,973 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = uti_CertificatesOfDepositDueInOneToTwoYearsMember

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