Quarterly Financial Information, Unaudited (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
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 195,629	$ 226,623	$ 203,372	$ 213,293	$ 245,365	$ 291,139	$ 236,190	$ 289,123	$ 838,917	$ 1,061,817	$ 927,087
Gross profit	45,770	54,675	46,094	42,208	51,104	67,331	52,686	66,107	188,747	237,228	198,621
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
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
Loss on disposal of business	$ (18,600)								$ (3,080)	$ (18,632)	$ 0
Gain (Loss) on Disposition of Assets	$ 9,200
Restructuring and impairment charges									$ 19,999	$ 18,632	$ 0