Restatement of Previously Issued Financial Statements - Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 196,329	$ 200,790	$ 401,612	$ 451,156
Cost of Sales	152,529	158,686	310,430	343,924
Gross Profit	43,800	42,104	91,182	107,232
Operating Income	17,387	15,107	37,410	51,416
Income Before Income Taxes	13,727	11,403	30,575	44,019
Income Tax Expense	3,941	1,244	8,727	11,671
Net Income	$ 9,786	$ 10,159	$ 21,848	$ 32,348
Basic Earnings Per Share (usd per share)	$ 0.38	$ 0.39	$ 0.84	$ 1.25
Diluted Earnings Per Share (usd per share)	$ 0.38	$ 0.39	$ 0.84	$ 1.24
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 190,407	$ 195,045	$ 398,958	$ 437,712
Cost of Sales	148,938	153,159	308,223	332,499
Gross Profit	41,469	41,886	90,735	105,213
Operating Income	15,056	14,889	36,963	49,397
Income Before Income Taxes	11,396	11,185	30,128	42,000
Income Tax Expense	3,067	1,162	8,559	10,914
Net Income	$ 8,329	$ 10,023	$ 21,569	$ 31,086
Basic Earnings Per Share (usd per share)	$ 0.32	$ 0.39	$ 0.83	$ 1.20
Diluted Earnings Per Share (usd per share)	$ 0.32	$ 0.38	$ 0.83	$ 1.19
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 5,922	$ 5,745	$ 2,654	$ 13,444
Cost of Sales	3,591	5,527	2,207	11,425
Gross Profit	2,331	218	447	2,019
Operating Income	2,331	218	447	2,019
Income Before Income Taxes	2,331	218	447	2,019
Income Tax Expense	874	82	168	757
Net Income	$ 1,457	$ 136	$ 279	$ 1,262
Basic Earnings Per Share (usd per share)	$ 0.06	$ 0.00	$ 0.01	$ 0.05
Diluted Earnings Per Share (usd per share)	$ 0.06	$ 0.01	$ 0.01	$ 0.05