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