Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning balance at Feb. 28, 2017	$ 251,355	$ 75,134	$ 121,525	$ 150,685	$ (15,261)	$ (80,728)
Beginning balance common stock, shares at Feb. 28, 2017		30,053,443
Beginning balance, treasury stock, shares at Feb. 28, 2017						(4,686,821)
Net earnings	32,905			32,905
Adjustment to pension (net of deferred tax of $1,030) and reclassification of the income tax effects of the US Tax Cuts and Jobs Act	1,680			2,847	(1,167)
Adjustment to pension, net of deferred tax of $92 and $2,834 respectively	1,680
Dividends paid ($0.875, $0.875 and $0.90 per share respectively)	(22,260)			(22,260)
Stock based compensation	1,337		1,337
Exercise of stock options and restricted stock			(1,529)			$ 1,529
Exercise of stock options and restricted stock, shares						88,771
Common stock repurchases	(3,313)					$ (3,313)
Common stock repurchases, shares						(191,178)
Ending balance at Feb. 28, 2018	261,704	$ 75,134	121,333	164,177	(16,428)	$ (82,512)
Ending balance common stock, shares at Feb. 28, 2018		30,053,443
Ending balance treasury stock, shares at Feb. 28, 2018						(4,789,228)
Net earnings	37,437			37,437
Adjustment to pension, net of deferred tax of $92 and $2,834 respectively	(276)				(276)
Dividends paid ($0.875, $0.875 and $0.90 per share respectively)	(22,611)			(22,611)
Stock based compensation	1,397		1,397
Exercise of stock options and restricted stock	69		(1,539)			$ 1,608
Exercise of stock options and restricted stock, shares						110,806
Common stock issued for acquisition of business	16,218		1,874			$ 14,344
Common stock issued for acquisition of business, shares						829,126
Common stock repurchases	(4,811)					$ (4,811)
Common stock repurchases, shares						(247,803)
Ending balance at Feb. 28, 2019	$ 289,127	$ 75,134	123,065	179,003	(16,704)	$ (71,371)
Ending balance common stock, shares at Feb. 28, 2019	30,053,443	30,053,443
Ending balance treasury stock, shares at Feb. 28, 2019						(4,097,099)
Net earnings	$ 38,292			38,292
Adjustment to pension, net of deferred tax of $92 and $2,834 respectively	(8,502)				(8,502)
Dividends paid ($0.875, $0.875 and $0.90 per share respectively)	(23,486)			(23,486)
Stock based compensation	1,369		1,369
Exercise of stock options and restricted stock			(1,382)			$ 1,382
Exercise of stock options and restricted stock, shares						87,143
Common stock repurchases	$ (2,471)					$ (2,471)
Common stock repurchases, shares	(126,330)					(126,330)
Ending balance at Feb. 29, 2020	$ 294,329	$ 75,134	$ 123,052	$ 193,809	$ (25,206)	$ (72,460)
Ending balance common stock, shares at Feb. 29, 2020	30,053,443	30,053,443
Ending balance treasury stock, shares at Feb. 29, 2020						(4,136,286)