Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Receivables [Abstract]
Balance at beginning of period	$ 1,016	$ 874	$ 961	$ 715
Bad debt expense, net of recoveries	249	153	408	933
Accounts written off	0	(76)	(104)	(697)
Balance at end of period	$ 1,265	$ 951	$ 1,265	$ 951