Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014
Receivables [Abstract]
Balance at beginning of period	$ 3,448	$ 3,584	$ 3,559	$ 3,672
Bad debt expense	798	494	1,412	725
Recoveries	10	10	45	29
Accounts written off	(204)	(113)	(964)	(451)
Balance at end of period	$ 4,052	$ 3,975	$ 4,052	$ 3,975