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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
Sales revenue, net	$ 326,042	$ 374,599	$ 287,411	$ 300,211	$ 294,004	$ 338,785	$ 277,420	$ 271,467	$ 1,288,263	$ 1,181,676	$ 777,043
Gross profit	131,580	148,453	117,030	121,148	123,107	133,182	112,282	109,913	518,211	478,484	349,246
Net Income	$ 31,507	$ 37,719	$ 22,968	$ 23,472	$ 29,297	$ 32,879	$ 23,593	$ 24,605	$ 115,666	$ 110,374	$ 93,305
Earnings per share:
Basic (in dollars per share)	$ 0.99	$ 1.19	$ 0.72	$ 0.74	$ 0.93	$ 1.04	$ 0.75	$ 0.80	$ 3.64	$ 3.52	$ 3.04
Diluted (in dollars per share)	$ 0.98	$ 1.18	$ 0.72	$ 0.74	$ 0.92	$ 1.04	$ 0.74	$ 0.78	$ 3.62	$ 3.48	$ 2.98

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