Guarantees And Contractual Obligations (Deferred Revenue And Warranties For Certain Products Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jan. 24, 2014	Jan. 25, 2013
Guarantees And Contractual Obligations [Abstract]
Balance	$ 78,818	$ 80,272
Additional net deferred revenue/warranty accrual made during the period	3,542	4,107
Warranty payments made during the period	(1,318)	(2,353)
Balance	$ 81,042	$ 82,026

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