Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_ProceedsFromLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Instrument, Covenant, Financial Responsibility Composite Score, Maximum

+ References

No definition available.

+ Details

Name:	uti_DebtInstrumentCovenantFinancialResponsibilityCompositeScoreMaximum
Namespace Prefix:	uti_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Line Of Credit Facility, Clean Off Provision, Threshold Trading Months

+ References

No definition available.

+ Details

Name:	uti_DebtInstrumentLineOfCreditFacilityCleanOffProvisionThresholdTradingMonths
Namespace Prefix:	uti_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Line Of Credit Facility, Threshold Consecutive Trading Days

+ References

No definition available.

+ Details

Name:	uti_DebtInstrumentLineOfCreditFacilityThresholdConsecutiveTradingDays
Namespace Prefix:	uti_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Derivative, Fixed Amount of Debt on Interest Rate

+ References

No definition available.

+ Details

Name:	uti_DerivativeFixedAmountOfDebtOnInterestRate
Namespace Prefix:	uti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Derivative, Fixed Amount of Debt on Interest Rate, Percentage

+ References

No definition available.

+ Details

Name:	uti_DerivativeFixedAmountOfDebtOnInterestRatePercentage
Namespace Prefix:	uti_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Clean Off Provision, Outstanding Amount

+ References

No definition available.

+ Details

Name:	uti_LineOfCreditFacilityCleanOffProvisionOutstandingAmount
Namespace Prefix:	uti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=uti_AvondaleTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=uti_LisleTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=uti_SecuredOvernightFinancingRateSOFRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=uti_FifthThirdBankNationalAssociationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=uti_ValleyNationalBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=uti_FifthThirdBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	uti_DebtInstrumentPeriodAxis=uti_DebtInstrumentPeriodAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	uti_DebtInstrumentPeriodAxis=uti_DebtInstrumentPeriodBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=uti_ConcordeCareerCollegesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	uti_VariableRateComponentAxis=uti_VariableRateComponentOptionAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	uti_VariableRateComponentAxis=uti_VariableRateComponentOptionBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Narrative (Details)					3 Months Ended
Debt - Narrative (Details)	Nov. 28, 2022 USD ($)	Nov. 18, 2022 USD ($) day month	Apr. 14, 2022 USD ($)	May 12, 2021 USD ($)	Dec. 31, 2022 USD ($)	Nov. 30, 2022 USD ($)
Avondale Term Loan
Debt Instrument [Line Items]
Interest Rate					6.12%
Lisle Term Loan
Debt Instrument [Line Items]
Interest Rate					6.12%
Secured Overnight Financing Rate (SOFR) \| Lisle Term Loan
Debt Instrument [Line Items]
Variable interest rate					2.00%
LIBOR \| Avondale Term Loan
Debt Instrument [Line Items]
Variable interest rate					2.00%
Fifth Third Bank, National Association \| Secured Debt \| Avondale Term Loan
Debt Instrument [Line Items]
Debt maturity term				7 years
Interest Rate				3.50%
Maximum principal amount				$ 31,200,000
Fixed rate on principal amount				50.00%
Fixed amount of debt				$ 15,600,000
Fifth Third Bank, National Association \| Secured Debt \| Lisle Term Loan
Debt Instrument [Line Items]
Debt maturity term			7 years
Interest Rate			4.69%
Fixed rate on principal amount			50.00%
Fifth Third Bank, National Association \| Secured Debt \| LIBOR \| Avondale Term Loan
Debt Instrument [Line Items]
Variable interest rate				2.00%
Valley National Bank \| Secured Debt \| Lisle Term Loan
Debt Instrument [Line Items]
Debt maturity term			7 years
Interest Rate			4.69%
Maximum principal amount			$ 38,000,000
Fixed rate on principal amount			50.00%
Fixed amount of debt			$ 19,000,000
Valley National Bank \| Secured Debt \| SOFR \| Lisle Term Loan
Debt Instrument [Line Items]
Variable interest rate			2.00%
Revolving Credit Facility
Debt Instrument [Line Items]
Interest Rate					6.54%
Revolving Credit Facility \| Fifth Third Bank \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 100,000,000
Debt maturity term		3 years
Revolving Credit Facility \| Fifth Third Bank \| Line of Credit \| Debt Instrument, Period A
Debt Instrument [Line Items]
Debt instrument, covenant, financial responsibility composite score, maximum		1.4
Revolving Credit Facility \| Fifth Third Bank \| Line of Credit \| Debt Instrument, Period B
Debt Instrument [Line Items]
Debt instrument, covenant, financial responsibility composite score, maximum		1.5
Revolving Credit Facility \| Fifth Third Bank \| Line of Credit \| Concorde Career Colleges Inc
Debt Instrument [Line Items]
Proceeds from lines of credit	$ 90,000,000
Interest Rate	6.54%
Revolving Credit Facility \| Fifth Third Bank \| Line of Credit \| Minimum
Debt Instrument [Line Items]
Variable interest rate		1.75%
Revolving Credit Facility \| Fifth Third Bank \| Line of Credit \| Maximum
Debt Instrument [Line Items]
Variable interest rate		2.25%
Revolving Credit Facility \| Fifth Third Bank \| Line of Credit \| Variable Rate Component, Option A
Debt Instrument [Line Items]
Variable interest rate		3.50%
Revolving Credit Facility \| Fifth Third Bank \| Line of Credit \| Variable Rate Component, Option A \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Variable interest rate		0.10%
Revolving Credit Facility \| Fifth Third Bank \| Line of Credit \| Variable Rate Component, Option B
Debt Instrument [Line Items]
Variable interest rate		0.00%
Revolving Credit Facility \| Fifth Third Bank \| Line of Credit \| Variable Rate Component, Option B \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Variable interest rate		0.15%
Revolving Credit Facility \| Fifth Third Bank \| Secured Debt
Debt Instrument [Line Items]
Debt issuance costs		$ 500,000
Letter of Credit \| Fifth Third Bank \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 20,000,000			$ 8,200,000
Maximum principal amount					$ 1,800,000
Debt instrument, line of credit facility, threshold trading months \| month		20
Line of credit facility, clean off provision, outstanding amount						$ 20,000,000
Debt instrument, line of credit facility, threshold consecutive trading days \| day		30