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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, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
Sales revenue, net	$ 312,520	$ 380,730	$ 319,387	$ 304,516	$ 326,042	$ 374,599	$ 287,411	$ 300,211	$ 1,317,153	$ 1,288,263	$ 1,181,676
Gross profit	125,582	147,701	123,255	120,165	131,580	148,453	117,030	121,148	516,703	518,211	478,484
Asset impairment charges				12,049					12,049
Net income	$ 11,014	$ 37,524	$ 23,318	$ 14,392	$ 31,507	$ 37,719	$ 22,968	$ 23,472	$ 86,248	$ 115,666	$ 110,374
Earnings per share:
Basic (in dollars per share)	$ 0.34	$ 1.17	$ 0.73	$ 0.45	$ 0.99	$ 1.19	$ 0.72	$ 0.74	$ 2.69	$ 3.64	$ 3.52
Diluted (in dollars per share)	$ 0.34	$ 1.16	$ 0.72	$ 0.45	$ 0.98	$ 1.18	$ 0.72	$ 0.74	$ 2.66	$ 3.62	$ 3.48

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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