Shareholders' Equity - Changes in Shareholders' Equity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended				6 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013 Common Stock [Member]	Feb. 28, 2013 Common Stock [Member]	Aug. 31, 2013 Additional Paid-in Capital [Member]	Aug. 31, 2013 Retained Earnings [Member]	Aug. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Aug. 31, 2013 Treasury Stock Shares [Member]
Shareholders Equity And Share Based Payments [Line Items]
Beginning Balance, Amount			$ 361,216		$ 75,134	$ 75,134	$ 122,186	$ 251,713	$ (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	9,801	7,592	18,307	11,471				18,307
Foreign currency translation, net of deferred tax of $575	(1,079)	1,257	(929)	(850)					(929)
Dividends declared ($.175 per share)			(4,587)					(4,587)
Stock based compensation			786				786
Exercise of stock options and restricted stock grants			45				(1,147)			1,192
Exercise of stock options and restricted stock grants, shares										66,753,000
Stock repurchases			(1)							(1)
Stock repurchases, shares			(49)							(49,000)
Ending Balance, Amount	$ 374,837		$ 374,837		$ 75,134	$ 75,134	$ 121,825	$ 265,433	$ (15,832)	$ (71,723)
Ending Balance, Shares	30,053,443		30,053,443		30,053,443	30,053,443
Ending Balance, Treasury Stock, Shares										(4,018,061)