v2.4.0.6

Related-party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2012 Insurance_Policies
Related-party Transactions (Textual) [Abstract]
Obligation period	2 years
Common shares elects to sell	$ 4,000
Period of refusal to purchase common shares	24 months
Insurance policies, number	2
Cumulative cash surrender value of the policies	$ 2,786

X

- Definition

Number of insurance policies.

+ References

No definition available.

+ Details

Name:	dfz_NumberOfInsurancePolicies
Namespace Prefix:	dfz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period of obligation.

+ References

No definition available.

+ Details

Name:	dfz_PeriodOfObligation
Namespace Prefix:	dfz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period of refusal to purchase common shares.

+ References

No definition available.

+ Details

Name:	dfz_PeriodOfRefusalToPurchaseCommonShares
Namespace Prefix:	dfz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dfz_RelatedPartyTransactionsTextualAbstract
Namespace Prefix:	dfz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Repurchase of stock nominal value.

+ References

No definition available.

+ Details

Name:	dfz_RepurchaseOfStockNominalValue
Namespace Prefix:	dfz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Technical Bulletin (FTB)

-Number 85-4

-Paragraph 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 4

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6812-107765

+ Details

Name:	us-gaap_CashSurrenderValueOfLifeInsurance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant