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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 6) (Subsequent event, Shakespeare, USD $) In Thousands, unless otherwise specified	0 Months Ended
	Oct. 06, 2014 item
Subsequent event | Shakespeare
Subsequent Events
Cash paid for acquisition	$ 48,000
Number of manufacturing locations operated	2
Annual sales	$ 55,000

X

- Definition

Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of operating locations operated by the acquired entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	vmi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant