Segments (Details) (USD $)	3 Months Ended				6 Months Ended
	Aug. 31, 2013 segment		Aug. 31, 2012		Aug. 31, 2013		Aug. 31, 2012
Segment Reporting Information [Line Items]
Number of operating segments	2
Operations and assets by segment
Net Sales	$ 189,782,229		$ 153,385,291		$ 372,956,848		$ 280,528,155
Operating Income	36,978,000	[1]	32,888,000	[1]	75,724,000	[1]	62,317,000	[1]
General Corporate Expense	7,187,000	[2]	5,342,000	[2]	17,658,000	[2]	12,074,000	[2]
Interest Expense	4,651,412		3,227,906		9,129,099		6,568,072
Other (Income) Expense, Net	(677,000)	[3]	(275,000)	[3]	(282,000)	[3]	(6,008,000)	[3]
Total expenses	11,161,000		8,295,000		26,505,000		12,634,000
Income Before Income Taxes	25,817,000		24,593,000		49,219,000		49,683,000
Total Assets	983,816,000		646,783,000		983,816,000		646,783,000
Electrical and Industrial Products [Member]
Operations and assets by segment
Net Sales	104,134,000		66,530,000		200,600,000		111,212,000
Operating Income	10,733,000	[1]	9,339,000	[1]	23,781,000	[1]	16,134,000	[1]
Total Assets	559,501,000		259,125,000		559,501,000		259,125,000
Galvanizing Services [Member]
Operations and assets by segment
Net Sales	85,648,000		86,855,000		172,357,000		169,316,000
Operating Income	26,245,000	[1]	23,549,000	[1]	51,943,000	[1]	46,182,000	[1]
Total Assets	379,828,000		311,630,000		379,828,000		311,630,000
Corporate [Member]
Operations and assets by segment
Total Assets	$ 44,487,000		$ 76,028,000		$ 44,487,000		$ 76,028,000

[1] Segment operating income consists of net sales, less cost of sales, specifically identifiable selling, general and administrative expenses, and other income and expense items that are specifically identifiable to a segment.

[2] General Corporate Expense consists of selling, general and administrative expenses that are not specifically identifiable to a segment.

[3] Other (income) expense, net includes gains or losses on sale of property, plant and equipment and other (income) expenses not specifically identifiable to a segment.