| **NASDAQ STAFF DEFICIENCY LETTER (Details) (USD $)**                         | 0 Months Ended |
|------------------------------------------------------------------------------|----------------|
||
| **Nasdaq Noncompliance [Abstract]**                                          |           |
| Number of consecutive business ays of noncompliance with listing rule (days) | 30 days        |
| Listing rule minimum share price requirement (dollars per share)             | $ 1.00         |
| Listing rule compliance grace period (days)                                  | 180 days       |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the grace period granted by a stock exchange, (i.e. NASDAQ, NYSE, etc.) granted to allow a reporting entity to satisfy a requirement necessary to be listed with the specific stock exchange.
+ References
No definition available.
+ Details**Name:**dlhc_ListingRuleComplianceGracePeriod**Namespace Prefix:**dlhc_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the minimum bid price requirement for continued listing on The Nasdaq Capital Market , as required by the Listing Rule.
+ References
No definition available.
+ Details**Name:**dlhc_ListingRuleMinimumSharePriceRequirement**Namespace Prefix:**dlhc_**Data Type:**num:perShareItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dlhc_NasdaqNoncomplianceAbstract**Namespace Prefix:**dlhc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the number of consecutive business days for which the entity was not in compliance with the Listing Rule of the Nasdaq Stock Market (Nasdaq).
+ References
No definition available.
+ Details**Name:**dlhc_NumberOfConsecutiveBusinessDaysOfNoncomplianceWithListingRule**Namespace Prefix:**dlhc_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |