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, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014 Common Stock [Member]	Feb. 28, 2014 Common Stock [Member]	Aug. 31, 2014 Additional Paid-in Capital [Member]	Aug. 31, 2014 Retained Earnings [Member]	Aug. 31, 2014 Accumulated Other Comprehensive Income (Loss) [Member]	Aug. 31, 2014 Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Amount			$ 362,935		$ 75,134	$ 75,134	$ 122,517	$ 251,137	$ (12,413)	$ (73,440)
Beginning Balance, Shares			30,053,443		30,053,443	30,053,443
Beginning Balance, Treasury Stock, Shares										(4,131,276)
Net earnings	10,016	9,801	18,048	18,307				18,048
Foreign currency translation, net of deferred tax of $328	(445)	(1,079)	535	(929)					535
Dividends declared ($.35 per share)			(9,141)					(9,141)
Stock based compensation			685				685
Exercise of stock options and restricted stock grants			54				(2,063)			2,117
Exercise of stock options and restricted stock grants, shares										119,061
Stock repurchases			(2,051)							(2,051)
Stock repurchases, shares										(138,551)
Ending Balance, Amount	$ 371,065		$ 371,065		$ 75,134	$ 75,134	$ 121,139	$ 260,044	$ (11,878)	$ (73,374)
Ending Balance, Shares	30,053,443		30,053,443		30,053,443	30,053,443
Ending Balance, Treasury Stock, Shares										(4,150,766)