Restatement of Previously Issued Financial Statements - Income Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 184,266	$ 228,116	$ 200,790	$ 250,366	$ 207,694	$ 241,596	$ 199,670	$ 240,440	$ 863,538	$ 889,400	$ 819,692
Cost of Sales									658,206	661,282	612,919
Gross profit	46,803	51,297	42,104	65,128	53,424	61,288	49,702	63,704	205,332	228,118	206,773
Operating Income (Loss)									98,908	120,295	107,902
Income before income taxes									85,297	102,375	91,207
Income Tax Expense									24,033	26,831	25,591
Net Income	$ 12,270	$ 16,646	$ 10,159	$ 22,189	$ 15,182	$ 22,822	$ 14,866	$ 22,674	$ 61,264	$ 75,544	$ 65,616
Basic Earnings Per Share (usd per share)	$ 0.47	$ 0.64	$ 0.39	$ 0.86	$ 0.59	$ 0.88	$ 0.58	$ 0.88	$ 2.36	$ 2.93	$ 2.56
Diluted Earnings Per Share (usd per share)	$ 0.47	$ 0.64	$ 0.39	$ 0.85	$ 0.58	$ 0.88	$ 0.57	$ 0.88	$ 2.35	$ 2.91	$ 2.55
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 193,759	$ 227,459	$ 195,045	$ 242,667	$ 217,611	$ 242,447	$ 214,246	$ 228,888	$ 858,930	$ 903,192	$ 816,687
Cost of Sales									654,146	673,081	610,991
Gross profit	45,705	53,866	41,886	63,327	54,854	62,448	53,505	59,304	204,784	230,111	205,696
Operating Income (Loss)									98,360	122,288	106,825
Income before income taxes									84,749	104,368	90,130
Income Tax Expense									23,828	27,578	25,187
Net Income	$ 11,584	$ 18,251	$ 10,023	$ 21,063	$ 16,076	$ 23,547	$ 17,243	$ 19,924	$ 60,921	$ 76,790	$ 64,943
Basic Earnings Per Share (usd per share)	$ 0.45	$ 0.70	$ 0.39	$ 0.81	$ 0.62	$ 0.91	$ 0.67	$ 0.77	$ 2.35	$ 2.98	$ 2.53
Diluted Earnings Per Share (usd per share)	$ 0.44	$ 0.70	$ 0.38	$ 0.81	$ 0.62	$ 0.91	$ 0.67	$ 0.77	$ 2.33	$ 2.96	$ 2.52
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales	$ (9,493)	$ 657	$ 5,745	$ 7,699	$ (9,917)	$ (851)	$ (14,576)	$ 11,552	$ 4,608	$ (13,792)	$ 3,005
Cost of Sales									4,060	(11,799)	1,928
Gross profit	1,098	(2,569)	218	1,801	(1,430)	(1,160)	(3,803)	4,400	548	(1,993)	1,077
Operating Income (Loss)									548	(1,993)	1,077
Income before income taxes									548	(1,993)	1,077
Income Tax Expense									205	(747)	404
Net Income	$ 686	$ (1,605)	$ 136	$ 1,126	$ (894)	$ (725)	$ (2,377)	$ 2,750	$ 343	$ (1,246)	$ 673
Basic Earnings Per Share (usd per share)	$ 0.02	$ (0.06)	$ 0.00	$ 0.05	$ (0.03)	$ (0.03)	$ (0.09)	$ 0.11	$ 0.01	$ (0.05)	$ 0.03
Diluted Earnings Per Share (usd per share)	$ 0.03	$ (0.06)	$ 0.01	$ 0.04	$ (0.04)	$ (0.03)	$ (0.10)	$ 0.11	$ 0.02	$ (0.05)	$ 0.03

Total costs related to goods produced and sold during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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