Condensed Consolidated Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock Series A Preferred Stock	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss
Balance (shares) at Feb. 28, 2021			25,108
Balance at Feb. 28, 2021	$ 623,292		$ 25,108	$ 75,979	$ 547,289	$ (25,084)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	4,682			4,682
Common stock issued under stock-based plans and related income tax expense (shares)			107
Common stock issued under stock-based plans and related income tax expense	(2,149)		$ 107	(2,256)
Common stock issued under employee stock purchase plan (shares)			41
Common stock issued under employee stock purchase plan	1,544		$ 41	1,503
Repurchase and retirement of treasury shares (shares)			(416)
Repurchase and retirement of treasury shares	(21,233)		$ (416)		(20,817)
Cash dividends paid	(8,510)				(8,510)
Net income (loss) available to common shareholders	41,315				41,315
Foreign currency translation	(515)				(70)	(445)
Balance (shares) at Aug. 31, 2021			24,840
Balance at Aug. 31, 2021	638,426		$ 24,840	79,908	559,207	(25,529)
Balance (shares) at May. 31, 2021			25,071
Balance at May. 31, 2021	637,411		$ 25,071	75,600	559,173	(22,433)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	2,871			2,871
Common stock issued under stock-based plans and related income tax expense (shares)			18
Common stock issued under stock-based plans and related income tax expense	(48)		$ 18	(66)
Common stock issued under employee stock purchase plan (shares)			41
Common stock issued under employee stock purchase plan	1,544		$ 41	1,503
Repurchase and retirement of treasury shares (shares)			(290)
Repurchase and retirement of treasury shares	(14,969)		$ (290)		(14,679)
Cash dividends paid	(4,265)				(4,265)
Net income (loss) available to common shareholders	18,978				18,978
Foreign currency translation	(3,096)				0	(3,096)
Balance (shares) at Aug. 31, 2021			24,840
Balance at Aug. 31, 2021	638,426		$ 24,840	79,908	559,207	(25,529)
Balance (shares) at Feb. 28, 2022		0	24,688
Balance at Feb. 28, 2022	667,365	$ 0	$ 24,688	85,847	584,154	(27,324)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	4,770			4,770
Issuance of Series A convertible preferred stock in exchange for convertible debt, shares (in shares)		240
Issuance of Series A convertible preferred stock in exchange for convertible debt	233,722	$ 240		233,482
Common stock issued under stock-based plans and related income tax expense (shares)			122
Common stock issued under stock-based plans and related income tax expense	(2,306)		$ 122	(2,428)
Common stock issued under employee stock purchase plan (shares)			52
Common stock issued under employee stock purchase plan	1,767		$ 52	1,715
Accrued dividends on preferred stock	(1,040)				(1,040)
Cash dividends paid	(8,418)				(8,418)
Net income (loss) available to common shareholders	(33,493)				(33,493)
Foreign currency translation	(2,746)				0	(2,746)
Balance (shares) at Aug. 31, 2022		240	24,862
Balance at Aug. 31, 2022	859,621	$ 240	$ 24,862	323,386	541,203	(30,070)
Balance (shares) at May. 31, 2022		0	24,788
Balance at May. 31, 2022	687,559	$ 0	$ 24,788	85,432	604,039	(26,700)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	2,772			2,772
Issuance of Series A convertible preferred stock in exchange for convertible debt, shares (in shares)		240
Issuance of Series A convertible preferred stock in exchange for convertible debt	233,722	$ 240		233,482
Common stock issued under stock-based plans and related income tax expense (shares)			22
Common stock issued under stock-based plans and related income tax expense	8		$ 22	(14)
Common stock issued under employee stock purchase plan (shares)			52
Common stock issued under employee stock purchase plan	1,766		$ 52	1,714
Accrued dividends on preferred stock	(1,040)				(1,040)
Cash dividends paid	(4,226)				(4,226)
Net income (loss) available to common shareholders	(57,570)				(57,570)
Foreign currency translation	(3,370)					(3,370)
Balance (shares) at Aug. 31, 2022		240	24,862
Balance at Aug. 31, 2022	$ 859,621	$ 240	$ 24,862	$ 323,386	$ 541,203	$ (30,070)