Segment Information (Narrative) (Details)	12 Months Ended
Oct. 26, 2012
Segment Reporting Information [Line Items]
Significant net sales percentage threshold	10.00%
Minimum [Member]
Segment Reporting Information [Line Items]
Percentage of net sales to a signficant customer	16.40%
Maximum [Member]
Segment Reporting Information [Line Items]
Percentage of net sales to a signficant customer	19.20%

Percentage of total net sales to one signficaint customer over the course of the last three fiscal years, including the current fiscal year. A customer is deemed significant if indiviudal net sales to that customer exceeds 10% of total net sales.

No definition available.

Name:	val_SignificantCustomerNetSalesPercentageOfTotal
Namespace Prefix:	val_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration