Guarantees And Contractual Obligations (Deferred Revenue And Warranties For Certain Products Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Jul. 27, 2012	Jul. 29, 2011
Guarantees And Contractual Obligations [Abstract]
Beginning balance, October	$ 73,679	$ 74,907
Additional net deferred revenue/accrual made during the period	14,830	11,060
Payments made during the period	(7,513)	(9,511)
Ending Balance	$ 80,996	$ 76,456

Amount of claims paid to customers during the period that were previously reported as product warranty liabilities. Amount of revenue recognized that was previously deferred.

No definition available.

Name:	val_DeferredRevenueRefundAndProductWarrantyLiabilityPayments
Namespace Prefix:	val_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration