Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Receivables [Abstract]
Balance at beginning of period	$ 1,820	$ 1,857	$ 2,041	$ 2,158
Bad debt expense, net of recoveries	15	509	118	394
Accounts written off	(203)	(88)	(527)	(274)
Balance at end of period	$ 1,632	$ 2,278	$ 1,632	$ 2,278