Consolidated Statement of Shareholders' Equity - CY Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (shares) at Feb. 28, 2019		26,115
Balance at Feb. 28, 2019	$ 603,728	$ 26,115	$ 46,141	$ 560,224	$ (28,752)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,350		1,350
Common stock issued from stock plans, net of shares withheld for employee taxes (shares)		37
Common stock issued from stock plans, net of shares withheld for employee taxes	(691)	$ 37	(728)
Cash dividends paid	(4,440)			(4,440)
Net income (loss)	21,284			21,284
Foreign currency translation	(1,960)				(1,960)
Interest rate swap	(14)				(14)
Balance (shares) at May. 31, 2019		26,152
Balance at May. 31, 2019	619,257	$ 26,152	46,763	577,068	(30,726)
Balance (shares) at Feb. 28, 2019		26,115
Balance at Feb. 28, 2019	603,728	$ 26,115	46,141	560,224	(28,752)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	36,842
Foreign currency translation	(1,219)
Balance (shares) at Aug. 31, 2019		26,221
Balance at Aug. 31, 2019	634,606	$ 26,221	50,211	588,172	(29,998)
Balance (shares) at May. 31, 2019		26,152
Balance at May. 31, 2019	619,257	$ 26,152	46,763	577,068	(30,726)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,736		1,736
Common stock issued from stock plans, net of shares withheld for employee taxes (shares)		18
Common stock issued from stock plans, net of shares withheld for employee taxes	0	$ 18	(18)
Cash dividends paid	(4,454)			(4,454)
Net income (loss)	15,558			15,558
Foreign currency translation	741				741
Interest rate swap	(13)				(13)
Common stock issued under employee stock purchase plan (shares)		51
Common stock issued under employee stock purchase plan	1,781	$ 51	1,730
Balance (shares) at Aug. 31, 2019		26,221
Balance at Aug. 31, 2019	634,606	$ 26,221	50,211	588,172	(29,998)
Balance (shares) at Feb. 29, 2020		26,148
Balance at Feb. 29, 2020	634,366	$ 26,148	66,703	572,414	(30,899)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,766		1,766
Common stock issued from stock plans, net of shares withheld for employee taxes (shares)		47
Common stock issued from stock plans, net of shares withheld for employee taxes	(539)	$ 47	(586)
Cash dividends paid	(4,425)			(4,425)
Net income (loss)	5,541			5,541
Foreign currency translation	(1,039)				(1,039)
Interest rate swap	(14)				(14)
Balance (shares) at May. 31, 2020		26,195
Balance at May. 31, 2020	635,656	$ 26,195	67,883	573,530	(31,952)
Balance (shares) at Feb. 29, 2020		26,148
Balance at Feb. 29, 2020	634,366	$ 26,148	66,703	572,414	(30,899)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,751
Foreign currency translation	3,499
Balance (shares) at Aug. 31, 2020		26,076
Balance at Aug. 31, 2020	631,541	$ 26,076	71,797	561,094	(27,426)
Balance (shares) at May. 31, 2020		26,195
Balance at May. 31, 2020	635,656	$ 26,195	67,883	573,530	(31,952)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	2,317		2,317
Common stock issued from stock plans, net of shares withheld for employee taxes (shares)		23
Common stock issued from stock plans, net of shares withheld for employee taxes	(16)	$ 23	(39)
Cash dividends paid	(4,467)			(4,467)
Net income (loss)	(1,790)			(1,790)
Foreign currency translation	4,540				4,540
Interest rate swap	(14)				(14)
Common stock issued under employee stock purchase plan (shares)		58
Common stock issued under employee stock purchase plan	1,694	$ 58	1,636
Retirement of treasury shares (shares)		(200)
Retirement of treasury shares	(6,379)	$ (200)		(6,179)
Balance (shares) at Aug. 31, 2020		26,076
Balance at Aug. 31, 2020	$ 631,541	$ 26,076	$ 71,797	$ 561,094	$ (27,426)