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Build-to-Suit Lease (Narrative) (Details)	12 Months Ended
	Sep. 30, 2018
Long Beach, California campus [Member]
Property, Plant and Equipment [Line Items]
Lessee Leasing Arrangements, Capital Leases, Term of Contract	15 years
Lisle Illinois Campus [Member]
Property, Plant and Equipment [Line Items]
Lessee Leasing Arrangements, Capital Leases, Term of Contract	18 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

No definition available.

+ Details

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X

- Definition

Term of the lessee's capital leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	uti_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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Period Type: