Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Receivables [Abstract]
Balance at beginning of period	$ 937	$ 1,326	$ 1,020	$ 1,194
Bad debt expense, net of recoveries	(90)	279	(68)	475
Accounts written off	(85)	(240)	(190)	(304)
Balance at end of period	$ 762	$ 1,365	$ 762	$ 1,365