Guarantees And Contractual Obligations (Deferred Revenue And Warranties For Certain Products Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jan. 27, 2012	Jan. 28, 2011
Guarantees And Contractual Obligations [Abstract]
Beginning balance, October	$ 73,679	$ 74,907
Additional net deferred revenue/accrual made during the period	7,839	3,981
Payments made during the period	(2,104)	(2,220)
Ending Balance	$ 79,414	$ 76,668

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