XML 93 R63.htm IDEA: XBRL DOCUMENT v3.24.3

Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Retirement Benefits [Abstract]
Defined contribution plan, recorded expense	$ 3.4	$ 2.6
Defined contribution plan, matching contributions period	4 years

X

- Definition

Represents the vesting period during which the employer contributes a matching contribution to the defined contribution plan.

+ References

No definition available.

+ Details

Name:	dlhc_DefinedContributionPlanEmployersMatchingContributionVestingPeriod
Namespace Prefix:	dlhc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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