v2.4.0.8

Nature of Operations and Basis of Presentation - Additional Information (Detail)	Dec. 28, 2013 sqft State
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of states	14
Area of real estate property	3,000

X

- Definition

Maximum area of product which entity target to produce.

+ References

No definition available.

+ Details

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Namespace Prefix:	dvly_
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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration