Long-Term Debt (Details Textual) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Oct. 28, 2012 Creditor
Long-Term Debt (Textual) [Abstract]
Senior secured credit facility, variable interest rate and interest rate in addition to base rate	3.00%
Long-Term Debt (Additional Textual) [Abstract]
Proceeds from term loan facility	$ 148,500
Debt issuance discount cost	1,500
Letters of credit outstanding	4,894
Letters of credit issued, minimum	12,000
Interest rate in addition to base rate under condition two	4.00%
Number of creditors for senior secured credit facility	22
Percentage of term loan held by Oak Hill Advisors, L.P.	9.43%
Term loan held by Oak Hill Advisors, L.P.	13,823
Senior notes	200,000
Senior notes fair value	226,400
Consolidated coverage ratio	2.00
Prior to June 1, 2013 [Member]
Long-Term Debt (Textual) [Abstract]
Percentage of redemption of senior notes	40.00%
Redemption price of notes as percentage of principal amount	111.00%
Maximum [Member]
Long-Term Debt (Textual) [Abstract]
Leverage ratio	4.50
Required leverage ratio	3.25
Redemption price of notes as percentage of principal amount	105.50%
Minimum [Member]
Long-Term Debt (Textual) [Abstract]
Fixed charge coverage ratio	1.10
Required fixed charge coverage ratio	1.30
Redemption price of notes as percentage of principal amount	100.00%
Letter of credit sub-facility [Member]
Long-Term Debt (Textual) [Abstract]
Senior secured credit facility	20,000
Swingline sub-facility [Member]
Long-Term Debt (Textual) [Abstract]
Senior secured credit facility	5,000
Sub-facility [Member]
Long-Term Debt (Textual) [Abstract]
Senior secured credit facility	1,000
Senior Notes [Member]
Long-Term Debt (Textual) [Abstract]
Maturity Date	Jun. 01, 2018
Interest Rate	11.00%
Frequency of interest payments - Senior Notes	semi-annually
Revolving credit facility [Member]
Long-Term Debt (Textual) [Abstract]
Senior secured credit facility	50,000
Maturity Date	Jun. 01, 2015
Credit facility, current borrowing	0
Term loan [Member]
Long-Term Debt (Textual) [Abstract]
Senior secured credit facility	150,000
Maturity Date	Jun. 01, 2016
Credit facility, current borrowing	146,625
Credit facility, current borrowing, net of discount	$ 145,763
Interest Rate	5.50%
Federal Funds Effective Rate plus [Member]
Long-Term Debt (Textual) [Abstract]
Senior secured credit facility, variable interest rate and interest rate in addition to base rate	0.50%

Consolidated coverage ratio.

No definition available.

Name:	davi_ConsolidatedCoverageRatio
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- Definition

Fixed charge coverage ratio.

+ References

No definition available.

+ Details

Name:	davi_FixedChargeCoverageRatio
Namespace Prefix:	davi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate in addition to base rate under condition two.

+ References

No definition available.

+ Details

Name:	davi_InterestRateInAdditionToBaseRateUnderConditionTwo
Namespace Prefix:	davi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Leverage ratio.

+ References

No definition available.

+ Details

Name:	davi_LeverageRatio
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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility current borrowing capacity net of discount.

+ References

No definition available.

+ Details

Name:	davi_LineOfCreditFacilityCurrentBorrowingCapacityNetOfDiscount
Namespace Prefix:	davi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	davi_LongTermDebtAdditionalTextualAbstract
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- Definition

Minimum letter of credit issued.

+ References

No definition available.

+ Details

Name:	davi_MinimumLetterOfCreditIssued
Namespace Prefix:	davi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of creditors for senior secured credit facility.

+ References

No definition available.

+ Details

Name:	davi_NumberOfCreditorsForSeniorSecuredCreditFacility
Namespace Prefix:	davi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of redemption of notes.

+ References

No definition available.

+ Details

Name:	davi_PercentageOfRedemptionOfNotes
Namespace Prefix:	davi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of term loan held by fund manager.

+ References

No definition available.

+ Details

Name:	davi_PercentageOfTermLoanHeldByFundManager
Namespace Prefix:	davi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Redemption price of notes as percentage of principal amount.

+ References

No definition available.

+ Details

Name:	davi_RedemptionPriceOfNotesAsPercentageOfPrincipalAmount
Namespace Prefix:	davi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Required fixed charge coverage ratio.

+ References

No definition available.

+ Details

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Namespace Prefix:	davi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Required leverage ratio.

+ References

No definition available.

+ Details

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Namespace Prefix:	davi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Term loan held by fund manager.

+ References

No definition available.

+ Details

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Namespace Prefix:	davi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-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.

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20,22)

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

+ Details

Name:	us-gaap_NotesPayableFairValueDisclosure
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

Name:	us-gaap_SeniorLongTermNotes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant