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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Selected Quarterly Financial Data (Unaudited)
Sales revenue, net	$ 376,697	$ 444,414	$ 368,170	$ 347,938	$ 385,724	$ 445,503	$ 369,129	$ 345,345	$ 1,537,219	$ 1,545,701	$ 1,445,131
Gross Profit	165,858	194,215	162,968	152,427	162,157	182,524	148,005	143,319	675,468	636,005	599,559
Asset Impairment Charges	5,000			7,400	3,000			3,000	12,400	6,000	9,000
Net Income	$ 35,696	$ 57,612	$ 28,355	$ 19,026	$ 9,588	$ 46,778	$ 24,452	$ 20,410	$ 140,689	$ 101,228	$ 131,164
Earnings per share:
Basic (in dollars per share)	$ 1.31	$ 2.10	$ 1.02	$ 0.69	$ 0.34	$ 1.66	$ 0.86	$ 0.72	$ 5.11	$ 3.58	$ 4.59
Diluted (in dollars per share)	$ 1.30	$ 2.07	$ 1.00	$ 0.68	$ 0.34	$ 1.63	$ 0.84	$ 0.70	$ 5.04	$ 3.52	$ 4.52

X

- Definition

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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