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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. 29, 2012	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2011	Nov. 30, 2010	Aug. 31, 2010	May 31, 2010	Feb. 29, 2012	Feb. 28, 2011	Feb. 28, 2010
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
Sales revenue, net	$ 294,004	$ 338,785	$ 277,420	$ 271,467	$ 237,066	$ 205,001	$ 174,823	$ 160,153	$ 1,181,676	$ 777,043	$ 647,626
Gross profit	123,107	133,182	112,282	109,913	103,798	92,745	80,276	72,427	478,484	349,246	279,156
Asset impairment charges					1,660			501		2,161	900
Net income	$ 29,297	$ 32,879	$ 23,593	$ 24,605	$ 24,382	$ 27,063	$ 23,473	$ 18,387	$ 110,374	$ 93,305	$ 71,817
Earnings per share
Basic (in dollars per share)	$ 0.93	$ 1.04	$ 0.75	$ 0.80	$ 0.79	$ 0.88	$ 0.77	$ 0.60	$ 3.52	$ 3.04	$ 2.38
Diluted (in dollars per share)	$ 0.92	$ 1.04	$ 0.74	$ 0.78	$ 0.77	$ 0.86	$ 0.75	$ 0.59	$ 3.48	$ 2.98	$ 2.32

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The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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