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Postemployment Benefits (Postemployment Activity) (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 6 Months Ended
Oct. 31, 2014
Mar. 31, 2015
Postemployment Benefits Disclosure [Line Items]    
Liability Beginning Balance $ 2,166us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent $ 2,166us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
Postemployment Benefit Charges 1,200us-gaap_PostemploymentBenefitsPeriodExpense 1,332us-gaap_PostemploymentBenefitsPeriodExpense
Cash Paid   (2,542)us-gaap_PaymentsForPostemploymentBenefits
Other Non-cash   (257)uti_PostEmploymentBenefitsOtherNonCashSettlementIncreaseDecrease
Liability Ending Balance   699us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
Severance    
Postemployment Benefits Disclosure [Line Items]    
Liability Beginning Balance 2,150us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
2,150us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Postemployment Benefit Charges   1,127us-gaap_PostemploymentBenefitsPeriodExpense
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Cash Paid   (2,402)us-gaap_PaymentsForPostemploymentBenefits
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Other Non-cash   (179)uti_PostEmploymentBenefitsOtherNonCashSettlementIncreaseDecrease
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Liability Ending Balance   696us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Other    
Postemployment Benefits Disclosure [Line Items]    
Liability Beginning Balance 16us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
16us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
Postemployment Benefit Charges   205us-gaap_PostemploymentBenefitsPeriodExpense
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
Cash Paid   (140)us-gaap_PaymentsForPostemploymentBenefits
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
Other Non-cash   (78)uti_PostEmploymentBenefitsOtherNonCashSettlementIncreaseDecrease
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
Liability Ending Balance   $ 3us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember