Shareholders' Equity - Changes in Shareholders' Equity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended				9 Months Ended				9 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013 Common Stock [Member]	Feb. 28, 2013 Common Stock [Member]	Nov. 30, 2013 Additional Paid-in Capital [Member]	Nov. 30, 2013 Retained Earnings [Member]	Nov. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Feb. 28, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Nov. 30, 2013 Treasury Stock Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Amount			$ 361,216		$ 75,134	$ 75,134	$ 122,186	$ 251,713	$ (15,588)	$ (14,903)	$ (72,914)
Beginning Balance, Shares			30,053,443		30,053,443	30,053,443
Beginning Balance, Treasury Stock, Shares											(4,084,765)
Net earnings	9,349	6,170	27,656	17,641				27,656
Foreign currency translation, net deferred tax of $424	244	384	(685)	(466)
Dividends declared ($.35 per share)			(9,175)					(9,175)
Stock based compensation			1,159				1,159
Exercise of stock options and restricted stock grants			89				(1,192)				1,281
Exercise of stock options and restricted stock grants, shares											71,753
Stock repurchases			(2)								(2)
Stock repurchases, shares			(112)								(112)
Ending Balance, Amount	$ 380,258		$ 380,258		$ 75,134	$ 75,134	$ 122,153	$ 270,194	$ (15,588)	$ (14,903)	$ (71,635)
Ending Balance, Shares	30,053,443		30,053,443		30,053,443	30,053,443
Ending Balance, Treasury Stock, Shares											(4,013,124)