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Accounts Receivable and Allowance for Doubtful Receivables (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Allowance for doubtful receivables
Balance at beginning of period	$ 4,410	$ 4,833	$ 4,403	$ 4,814
Bad debt expense		(473)	287	69
Recoveries	5	12	24	184
Accounts written off	(732)	(36)	(1,031)	(731)
Foreign currency translation		(3)		(3)
Balance at end of period	$ 3,683	$ 4,333	$ 3,683	$ 4,333

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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