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Leases - Narrative (Details)	9 Months Ended
	Jun. 30, 2023 campus location
Lessee, Lease, Description [Line Items]
Number of lease contracts	29
Number of leasable campuses	33
Number of corporate office locations leased | location	3
Minimum
Lessee, Lease, Description [Line Items]
Lease term	5 years
Maximum
Lessee, Lease, Description [Line Items]
Lease term	20 years

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

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- Definition

Lessee, Operating Lease, Number Of Contracts

+ References

No definition available.

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- Definition

Operating Lease, Number Of Corporate Office Locations Leased

+ References

No definition available.

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Namespace Prefix:	uti_
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Balance Type:	na
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X

- Definition

Operating Lease, Number Of Leasable Campuses

+ References

No definition available.

+ Details

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Namespace Prefix:	uti_
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