Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Feb. 28, 2017	Feb. 29, 2016
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 292,527	$ 279,074
Acquisitions	13,386	15,576
Foreign Exchange Translation	666	(2,123)
Goodwill, ending balance	306,579	292,527
Galvanizing Services [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	109,314	95,538
Acquisitions	0	15,576
Foreign Exchange Translation	666	(1,800)
Goodwill, ending balance	109,980	109,314
Energy [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	183,213	183,536
Acquisitions	13,386	0
Foreign Exchange Translation	0	(323)
Goodwill, ending balance	$ 196,599	$ 183,213

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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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.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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