CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenue	$ 395,173	$ 246,094
Contract costs	322,886	194,614
General and administrative costs	30,730	25,054
Corporate development costs	614	1,088
Depreciation and amortization	7,665	8,115
Total operating costs	361,895	228,871
Income from operations	33,278	17,223
Interest expense	2,215	3,784
Income before provision for income taxes	31,063	13,439
Provision for income taxes	7,775	3,294
Net income	$ 23,288	$ 10,145
Earnings Per Share [Abstract]
Net income per share - basic (in dollars per share)	$ 1.82	$ 0.81
Net income per share - diluted (in dollars per share)	$ 1.64	$ 0.75
Weighted average common shares outstanding
Basic (in shares)	12,830	12,549
Diluted (in shares)	14,179	13,597

EPS, Basic and Diluted, Other Disclosures

No definition available.

Name:	dlhc_EPSBasicAndDilutedOtherDisclosuresAbstract
Namespace Prefix:	dlhc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI https://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460