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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, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
Sales revenue, net	$ 377,730us-gaap_SalesRevenueNet	$ 435,674us-gaap_SalesRevenueNet	$ 319,949us-gaap_SalesRevenueNet	$ 311,778us-gaap_SalesRevenueNet	$ 312,520us-gaap_SalesRevenueNet	$ 380,730us-gaap_SalesRevenueNet	$ 319,387us-gaap_SalesRevenueNet	$ 304,516us-gaap_SalesRevenueNet	$ 1,445,131us-gaap_SalesRevenueNet	$ 1,317,153us-gaap_SalesRevenueNet	$ 1,288,263us-gaap_SalesRevenueNet
Gross Profit	164,884us-gaap_GrossProfit	181,411us-gaap_GrossProfit	133,744us-gaap_GrossProfit	119,520us-gaap_GrossProfit	125,582us-gaap_GrossProfit	147,701us-gaap_GrossProfit	123,255us-gaap_GrossProfit	120,165us-gaap_GrossProfit	599,559us-gaap_GrossProfit	516,703us-gaap_GrossProfit	518,211us-gaap_GrossProfit
Asset Impairment Charges				9,000us-gaap_AssetImpairmentCharges				12,049us-gaap_AssetImpairmentCharges	9,000us-gaap_AssetImpairmentCharges	12,049us-gaap_AssetImpairmentCharges
Net Income	$ 40,550us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 55,377us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 18,839us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 16,398us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 11,014us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 37,524us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 23,318us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 14,392us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 131,164us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 86,248us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 115,666us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per share:
Basic (in dollars per share)	$ 1.42us-gaap_EarningsPerShareBasic	$ 1.95us-gaap_EarningsPerShareBasic	$ 0.66us-gaap_EarningsPerShareBasic	$ 0.56us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ 1.17us-gaap_EarningsPerShareBasic	$ 0.73us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 4.59us-gaap_EarningsPerShareBasic	$ 2.69us-gaap_EarningsPerShareBasic	$ 3.64us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 1.40us-gaap_EarningsPerShareDiluted	$ 1.92us-gaap_EarningsPerShareDiluted	$ 0.65us-gaap_EarningsPerShareDiluted	$ 0.55us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 1.16us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 4.52us-gaap_EarningsPerShareDiluted	$ 2.66us-gaap_EarningsPerShareDiluted	$ 3.62us-gaap_EarningsPerShareDiluted

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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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