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Change in Accounting Estimate (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Change in Accounting Estimate
Operating income	$ 65,043us-gaap_OperatingIncomeLoss	$ 49,393us-gaap_OperatingIncomeLoss	$ 112,769us-gaap_OperatingIncomeLoss	$ 100,374us-gaap_OperatingIncomeLoss
Net Income	55,377	37,524	90,614	75,233
Diluted earnings per share (in dollars per share)	$ 1.92us-gaap_EarningsPerShareDiluted	$ 1.16us-gaap_EarningsPerShareDiluted	$ 3.12us-gaap_EarningsPerShareDiluted	$ 2.33us-gaap_EarningsPerShareDiluted
Revision to product liability estimates
Change in Accounting Estimate
Operating income	2,220		2,220
Net Income	$ 1,360		$ 1,360
Diluted earnings per share (in dollars per share)	$ 0.05		$ 0.05

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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