Consolidated Statement of Shareholders' Equity - PY 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 under stock-based plans and related income tax expense (shares)		37
Common stock issued under stock-based plans and related income tax expense	(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)	58,877
Foreign currency translation	(1,434)
Interest rate swap	(41)
Balance (shares) at Nov. 30, 2019		26,240
Balance at Nov. 30, 2019	653,243	$ 26,240	51,484	605,746	(30,227)
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 under stock-based plans and related income tax expense (shares)		51
Common stock issued under stock-based plans and related income tax expense	1,781	$ 51	1,730
Cash dividends paid	(4,454)			(4,454)
Net income (loss)	15,558			15,558
Foreign currency translation	741				741
Interest rate swap	(13)				(13)
Balance (shares) at Aug. 31, 2019		26,221
Balance at Aug. 31, 2019	634,606	$ 26,221	50,211	588,172	(29,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,818		1,818
Common stock issued under stock-based plans and related income tax expense (shares)		19
Common stock issued under stock-based plans and related income tax expense	(526)	$ 19	(545)
Cash dividends paid	(4,461)			(4,461)
Net income (loss)	22,035			22,035
Foreign currency translation	(215)				(215)
Interest rate swap	(14)				(14)
Balance (shares) at Nov. 30, 2019		26,240
Balance at Nov. 30, 2019	653,243	$ 26,240	51,484	605,746	(30,227)
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 under stock-based plans and related income tax expense (shares)		47
Common stock issued under stock-based plans and related income tax expense	(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)	23,454
Foreign currency translation	3,756
Interest rate swap	(42)
Balance (shares) at Nov. 30, 2020		25,430
Balance at Nov. 30, 2020	624,078	$ 25,430	73,390	552,443	(27,185)
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 under stock-based plans and related income tax expense (shares)		23
Common stock issued under stock-based plans and related income tax expense	(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)
Balance (shares) at Aug. 31, 2020		26,076
Balance at Aug. 31, 2020	631,541	$ 26,076	71,797	561,094	(27,426)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,690		1,690
Common stock issued under stock-based plans and related income tax expense (shares)		6
Common stock issued under stock-based plans and related income tax expense	(91)	$ 6	(97)
Cash dividends paid	(4,432)			(4,432)
Net income (loss)	19,703			19,703
Foreign currency translation	255				255
Interest rate swap	(14)				(14)
Balance (shares) at Nov. 30, 2020		25,430
Balance at Nov. 30, 2020	$ 624,078	$ 25,430	$ 73,390	$ 552,443	$ (27,185)