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Postemployment Benefits (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Oct. 31, 2014 Employee | Dec. 31, 2014
Schedule of Postemployment Benefits [Line Items] |  |
Number of impacted employees due to reduction in workforce | 50 uti_NumberOfImpactedEmployeesDueToReductionInWorkforce |
Expiration Period Of Postemployment Benefits Agreements |  | 2015-12
Postemployment benefit expense | $ 1,200 us-gaap_PostemploymentBenefitsPeriodExpense | $ 1,278 us-gaap_PostemploymentBenefitsPeriodExpense
Minimum [Member] |  |
Schedule of Postemployment Benefits [Line Items] |  |
Period for payment of post employment benefit |  | 1 month
Maximum [Member] |  |
Schedule of Postemployment Benefits [Line Items] |  |
Period for payment of post employment benefit |  | 24 months
Employee Severance [Member] |  |
Schedule of Postemployment Benefits [Line Items] |  |
Postemployment benefit expense |  | $ 1,081 us-gaap_PostemploymentBenefitsPeriodExpense / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember

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- Definition Period expense related to postemployment benefits. + References No definition available. + Details
Name: | us-gaap_PostemploymentBenefitsPeriodExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Expiration Period Of Postemployment Benefits Agreements + References No definition available. + Details
Name: | uti_ExpirationPeriodOfPostemploymentBenefitsAgreements
Namespace Prefix: | uti_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of impacted employees due to reduction in workforce. + References No definition available. + Details
Name: | uti_NumberOfImpactedEmployeesDueToReductionInWorkforce
Namespace Prefix: | uti_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period for payment of post employment benefit. + References No definition available. + Details
Name: | uti_PeriodForPaymentOfPostEmploymentBenefit
Namespace Prefix: | uti_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | uti_ScheduleOfPostemploymentBenefitsLineItems
Namespace Prefix: | uti_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |