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Roll Forward of Allowance For Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Allowance for Doubtful Accounts [Line Items]
Beginning of year	$ 522	$ 602	$ 536
Provision for doubtful accounts	445	233	500
Write-offs	(510)	(313)	(434)
End of year	$ 457	$ 522	$ 602

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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