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

Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

+ Details

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

- 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)

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

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

- Definition

The pre-tax gain or loss recognized upon settlement of treasury lock contracts during the period. The gain (loss) will be reclassified ratably as a decrease (increase) to interest expense over the term of the related debt.

+ References

No definition available.

+ Details

Name:	val_GainLossOnSettlementOfTreasuryLockContracts
Namespace Prefix:	val_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Aggregate notional amount of all interest rate derivatives related to forecasted issuances of debt instruments designated as cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

+ References

No definition available.

+ Details

Name:	val_NotionalAmountOfInterestRateDerivativesRelatedToForecastedDebtIssuances
Namespace Prefix:	val_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Aggregate notional amount of all interest rate derivatives related to outstanding debt instruments designated as cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

+ References

No definition available.

+ Details

Name:	val_NotionalAmountOfInterestRateDerivativesRelatedToOutstandingDebt
Namespace Prefix:	val_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Derivative Financial Instruments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Jan. 27, 2012	Jul. 27, 2012	Jul. 29, 2011	Apr. 29, 2011 Interest Rate Derivative Contracts [Member]	Jul. 29, 2011 Foreign Currency Contracts Maturing In 2011 [Member]	Jul. 27, 2012 Foreign Currency Contracts Maturing In 2012 [Member]	Jul. 29, 2011 Foreign Currency Contracts Maturing In 2012 [Member]	Jul. 27, 2012 Foreign Currency Contracts Maturing In 2013 [Member]	Jan. 27, 2012 Treasury Lock Contracts [Member]	Jul. 29, 2011 Treasury Lock Contracts [Member]	Jul. 27, 2012 Senior Notes Due 2022 At 4.20% [Member]	Jan. 27, 2012 Senior Notes Due 2022 At 4.20% [Member]
Derivative [Line Items]
Notional amount of interest rate derivatives related to outstanding debt				$ 50,000					$ 200,000
Notional amount of interest rate derivatives related to forecasted debt issuances										200,000
Notional amount of foreign currency contracts					3,249	3,249	6,432	2,786
Settlement of treasury lock contracts	(27,875)	(27,875)	0
Unsecured senior notes											$ 400,000	$ 400,000