Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Feb. 28, 2019	Feb. 28, 2018
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 321,307	$ 306,579
Acquisitions	3,063	14,066
Foreign Exchange Translation	(614)	662
Goodwill, ending balance	323,756	321,307
Galvanizing Services [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	117,232	109,980
Acquisitions	73	6,590
Foreign Exchange Translation	(614)	662
Goodwill, ending balance	116,691	117,232
Energy [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	204,075	196,599
Acquisitions	2,990	7,476
Foreign Exchange Translation	0	0
Goodwill, ending balance	$ 207,065	$ 204,075

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=77989000&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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