Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Receivables [Abstract]
Balance at beginning of period	$ 874	$ 937	$ 715	$ 1,020
Bad debt expense, net of recoveries	153	(90)	933	(68)
Accounts written off	(76)	(85)	(697)	(190)
Balance at end of period	$ 951	$ 762	$ 951	$ 762