Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended
	May 31, 2020	May 31, 2019
Receivables [Abstract]
Balance at beginning of period	$ 715	$ 1,020
Bad debt expense, net of recoveries	648	40
Accounts written off	(423)	(19)
Balance at end of period	$ 940	$ 1,041