Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Lives

No definition available.

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

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Stock Price Threshold Term

+ References

No definition available.

+ Details

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

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Threshold Vesting Price

+ References

No definition available.

+ Details

Name:	dlhc_SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsThresholdVestingPrice
Namespace Prefix:	dlhc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Per share weighted average intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodIntrinsicValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

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

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardDateAxis=dlhc_GrantDateOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=dlhc_GrantDateTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=dlhc_GrantDateThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=dlhc_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeLowerRangeLimitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=dlhc_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeUpperRangeLimitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock-based Compensation and Equity Grants - Stock Options Fair Value Assumptions (Details) - $ / shares			12 Months Ended
	Dec. 01, 2017	Nov. 29, 2017	Sep. 30, 2018	Sep. 30, 2017
11/29/2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Strike price (in dollars per share)		$ 6.46
Stock price (in dollars per share)		6.46
Vesting threshold price (in dollars per share)		12
Calculated fair value (in dollars per share)		$ 3.98
12/01/2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Strike price (in dollars per share)	$ 6.28
Stock price (in dollars per share)	6.28
Vesting threshold price (in dollars per share)	8
Calculated fair value (in dollars per share)	3.87
12/01/2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Strike price (in dollars per share)	6.28
Stock price (in dollars per share)	6.28
Vesting threshold price (in dollars per share)	10
Calculated fair value (in dollars per share)	$ 3.82
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate				2.46%
Contractual term			10 years	10 years
Dividend yield				0.00%
Expected lives				10 years
Expected volatility			50.00%	144.00%
Stock price threshold term			10 days
Employee Stock Option \| 11/29/2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate		2.40%
Contractual term		10 years
Employee Stock Option \| 12/01/2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate	2.40%
Contractual term	10 years
Employee Stock Option \| 12/01/2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate	2.40%
Contractual term	10 years
Employee Stock Option \| Lower Range Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per option (in dollars per share)				$ 0.93
Employee Stock Option \| Upper Range Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per option (in dollars per share)				$ 1.47