Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Receivables [Abstract]
Balance at beginning of period	$ 1,787	$ 2,257	$ 2,041	$ 2,158
Bad debt expense, net of recoveries	101	(332)	103	(114)
Accounts written off	(68)	(68)	(324)	(187)
Balance at end of period	$ 1,820	$ 1,857	$ 1,820	$ 1,857