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Significant Accounting Policies - Schedule of Fee by Series and Share Class (Details)	Feb. 29, 2012
Class A, C, and I Shares
Revenue Recognition Principal Transaction [Line Items]
Rate of Administrative Service Fees	0.25%
Class Y
Revenue Recognition Principal Transaction [Line Items]
Rate of Administrative Service Fees	0.10%

X

- Definition

Rate of administrative service fees.

+ References

No definition available.

+ Details

Name:	dhil_RateOfAdministrativeServiceFees
Namespace Prefix:	dhil_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	dhil_RevenueRecognitionPrincipalTransactionLineItems
Namespace Prefix:	dhil_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration