Goodwill and Intangible Assets (Details 2) (USD $) In Thousands	Sep. 24, 2011	Dec. 25, 2010
Trade names
Non-amortized intangible assets
Carrying value of trade names	$ 59,893	$ 59,992
Webforge
Non-amortized intangible assets
Carrying value of trade names	16,563	16,478
Newmark
Non-amortized intangible assets
Carrying value of trade names	11,111	11,111
Ingal EPS/Ingal Civil Products
Non-amortized intangible assets
Carrying value of trade names	8,794	8,795
Donhad
Non-amortized intangible assets
Carrying value of trade names	6,634	6,635
PiRod
Non-amortized intangible assets
Carrying value of trade names	4,750	4,750
Industrial Galvanizers
Non-amortized intangible assets
Carrying value of trade names	4,628	4,632
Other.
Non-amortized intangible assets
Carrying value of trade names	$ 7,413	$ 7,591

Sum of the carrying amounts (original costs for current and prior period additions adjusted for impairment, if any) as of the balance sheet date of intangible assets, excluding goodwill, having a projected indefinite period of benefit.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

Name:	us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant