v2.4.1.9

Nature of Operations and Basis of Presentation - Additional Information (Detail)	Dec. 27, 2014 State
Nature Of Operations And Basis Of Accounting Presentation [Line Items]
Number of states	14us-gaap_NumberOfStatesInWhichEntityOperates
Scenario, Plan [Member] | Factory-built Housing [Member] | Maximum [Member]
Nature Of Operations And Basis Of Accounting Presentation [Line Items]
Area of real estate property	3,000us-gaap_AreaOfRealEstateProperty / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementBusinessSegmentsAxis = dvly_FactoryBuiltHousingMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember

X

- Details

Name:	dvly_NatureOfOperationsAndBasisOfAccountingPresentationLineItems
Namespace Prefix:	dvly_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: