Guarantees And Contractual Obligations (Deferred Revenue And Warranties For Certain Products Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jan. 25, 2013	Jan. 27, 2012
Guarantees And Contractual Obligations [Abstract]
Beginning balance, October	$ 80,272	$ 73,679
Additional net deferred revenue/accrual made during the period	4,107	7,839
Payments made during the period	(2,353)	(2,104)
Ending Balance	$ 82,026	$ 79,414

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