Restatement of Previously Issued Financial Statements - Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	May 31, 2017	May 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 205,283	$ 250,366
Cost of Sales	157,901	185,238
Gross Profit	47,382	65,128
Operating Income	20,023	36,309
Income Before Income Taxes	16,848	32,616
Income Tax Expense	4,786	10,427
Net Income	$ 12,062	$ 22,189
Basic Earnings Per Share (usd per share)	$ 0.46	$ 0.86
Diluted Earnings Per Share (usd per share)	$ 0.46	$ 0.85
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 208,551	$ 242,667
Cost of Sales	159,285	179,340
Gross Profit	49,266	63,327
Operating Income	21,907	34,508
Income Before Income Taxes	18,732	30,815
Income Tax Expense	5,492	9,752
Net Income	$ 13,240	$ 21,063
Basic Earnings Per Share (usd per share)	$ 0.51	$ 0.81
Diluted Earnings Per Share (usd per share)	$ 0.51	$ 0.81
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales	$ (3,268)	$ 7,699
Cost of Sales	(1,384)	5,898
Gross Profit	(1,884)	1,801
Operating Income	(1,884)	1,801
Income Before Income Taxes	(1,884)	1,801
Income Tax Expense	(706)	675
Net Income	$ (1,178)	$ 1,126
Basic Earnings Per Share (usd per share)	$ (0.05)	$ 0.05
Diluted Earnings Per Share (usd per share)	$ (0.05)	$ 0.04