Goodwill and Intangible Assets - Schedule of Goodwill (Details) (USD $)	12 Months Ended
Feb. 28, 2015	Feb. 28, 2014
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 278,556,000us-gaap_Goodwill	$ 171,886,000us-gaap_Goodwill
Acquisitions	4,113,000us-gaap_GoodwillAcquiredDuringPeriod	109,636,000us-gaap_GoodwillAcquiredDuringPeriod
Foreign Exchange Translation	(3,595,000)us-gaap_GoodwillTranslationAdjustments	(2,966,000)us-gaap_GoodwillTranslationAdjustments
Goodwill, ending balance	279,074,000us-gaap_Goodwill	278,556,000us-gaap_Goodwill
Galvanizing Services [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	94,731,000	96,735,000
Acquisitions	3,306,000	0
Foreign Exchange Translation	(2,499,000)	(2,004,000)
Goodwill, ending balance	95,538,000	94,731,000
Energy [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	183,825,000	75,151,000
Acquisitions	807,000	109,636,000
Foreign Exchange Translation	(1,096,000)	(962,000)
Goodwill, ending balance	$ 183,536,000	$ 183,825,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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

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-Name Accounting Standards Codification

-Topic 350

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-Section 45

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

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