Shareholders Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended				9 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012 Common Stock [Member]	Feb. 29, 2012 Common Stock [Member]	Nov. 30, 2012 Additional Paid-in Capital [Member]	Nov. 30, 2012 Retained Earnings [Member]	Nov. 30, 2012 Accumulated Other Comprehensive Income (Loss) [Member]	Nov. 30, 2012 Treasury Stock [Member]
Changes in shareholders' equity accounts
Beginning Balance, Amount			$ 359,875		$ 75,134	$ 75,134	$ 121,390	$ 249,862	$ (12,785)	$ (73,726)
Beginning Balance, Shares			30,053,443		30,053,443	30,053,443
Beginning Balance, Treasury Stock, Shares			(4,129,668)							(4,129,668)
Net earnings	6,170	6,892	17,641	28,028				17,641
Foreign currency translation, net of deferred tax of $288	384	(2,790)	(466)	(2,659)					(466)
Dividends declared ($.525 per share)			(13,711)					(13,711)
Stock based compensation			1,078				1,078
Exercise of stock options and restricted stock grants			35				(689)			724
Exercise of stock options and restricted stock grants, shares										40,578
Stock repurchases			(2)							(2)
Stock repurchases, shares			(175)							(175)
Ending Balance, Treasury Stock, Shares	(4,089,265)		(4,089,265)
Ending Balance, Amount	$ 364,450		$ 364,450		$ 75,134	$ 75,134	$ 121,779	$ 253,792	$ (13,251)	$ (73,004)
Ending Balance, Shares	30,053,443		30,053,443		30,053,443	30,053,443				4,089,265