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Leases - Narrative (Details)	12 Months Ended
	Sep. 30, 2022 sublease_option sublease
Leases [Abstract]
Number of subleased facilities | sublease	1
Sublease term	5 years
Number of sublease extension options | sublease_option	2
Sublease option extension period	1 year
Weighted-average remaining lease term	7 years 6 months
Weighted-average discount rate	6.00%

X

- Definition

Lessee, Operating Sublease, Lease Term

+ References

No definition available.

+ Details

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- Definition

Lessee, Operating Sublease, Number

+ References

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X

- Definition

Lessee, Operating Sublease, Number Of Options To Extend

+ References

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- Definition

Lessee, Operating Sublease, Option Extension Period

+ References

No definition available.

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Namespace Prefix:	dlhc_
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- References

No definition available.

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X

- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

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- Definition

Weighted average remaining lease term for 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/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

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