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Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2017
May 31, 2016
Receivables [Abstract]    
Balance at beginning of period $ 1,674 $ 2,041
Bad debt expense, net of recoveries (166) 2
Accounts written off (66) (256)
Balance at end of period $ 1,442 $ 1,787