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- Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 28, 2021	Nov. 30, 2020	Aug. 31, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019
Numerator:
Net income (loss)	$ 16,160	$ 19,703	$ (1,790)	$ 5,541	$ (10,643)	$ 22,035	$ 15,558	$ 21,284	$ 39,614	$ 48,234	$ 51,208
Denominator:
Denominator for basic earnings per common share-weighted average shares (shares)									25,897,000	26,191,000	26,038,000
Effect of dilutive securities:
Employee and Director stock awards (shares)									148,000	90,000	69,000
Denominator for diluted earnings per common share (shares)									26,045,000	26,281,000	26,107,000
Earnings per share basic and diluted:
Basic earnings per common share (usd per share)	$ 0.64	$ 0.76	$ (0.07)	$ 0.21	$ (0.41)	$ 0.84	$ 0.59	$ 0.81	$ 1.53	$ 1.84	$ 1.97
Diluted earnings per common share (usd per share)	$ 0.63	$ 0.76	$ (0.07)	$ 0.21	$ (0.41)	$ 0.84	$ 0.59	$ 0.81	$ 1.52	$ 1.84	$ 1.96