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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Selected Quarterly Financial Data (Unaudited)
Sales revenue, net	$ 390,847	$ 423,709	$ 347,205	$ 327,986	$ 347,369	$ 412,251	$ 335,058	$ 311,998	$ 1,489,747	$ 1,406,676	$ 1,392,575
Gross Profit	161,298	181,005	145,733	134,065	144,607	171,927	139,390	126,633	622,101	582,557	525,734
Asset Impairment Charges	11,447			4,000	500			2,400	15,447	2,900	6,000
Income from continuing operations	8,378	58,624	34,572	27,308	34,425	56,774	29,465	23,646	128,882	144,310	92,991
Income (loss) from discontinued operations, net of tax	$ 51,703	$ (89,060)	$ (25,639)	$ (21,440)	$ 1,271	$ 838	$ (1,110)	$ (4,620)	$ (84,436)	$ (3,621)	$ 8,237
Earnings (loss) per share - basic
Continuing operations	$ 0.31	$ 2.16	$ 1.27	$ 1.01	$ 1.27	$ 2.07	$ 1.06	$ 0.85	$ 4.76	$ 5.24	$ 3.29
Discontinued operations	1.91	(3.28)	(0.94)	(0.79)	0.05	0.03	(0.04)	(0.17)	(3.12)	(0.13)	0.29
Total earnings per share - basic	2.22	(1.12)	0.33	0.22	1.31	2.10	1.02	0.69	1.64	5.11	3.58
Earnings (loss) per share - diluted
Continuing operations	0.31	2.15	1.26	1.00	1.25	2.04	1.04	0.84	4.73	5.17	3.23
Discontinued operations	1.91	(3.27)	(0.94)	(0.79)	0.05	0.03	(0.04)	(0.16)	(3.10)	(0.13)	0.29
Total earnings per share - diluted	$ 2.22	$ (1.12)	$ 0.33	$ 0.22	$ 1.30	$ 2.07	$ 1.00	$ 0.68	$ 1.63	$ 5.04	$ 3.52

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