Accounts Payable (Details) (USD $) In Thousands, unless otherwise specified	Apr. 26, 2013	Oct. 26, 2012	Apr. 27, 2012
Accounts Payable [Abstract]
Outstanding checks included in trade accounts payable	$ 34,022	$ 39,762	$ 37,166

Carrying value as of the balance sheet date of checks that have been issued but have not cleared. The obligations incurred are still included in the trade accounts payable balance.

No definition available.

Name:	val_OutstandingChecksIncludedInTradeAccountsPayable
Namespace Prefix:	val_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant