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Supplemental Disclosures of Cash Paid (Refunded) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Other Significant Noncash Transactions [Line Items]
Interest	$ 180	$ 21	$ 56
Income taxes	$ 15,579	$ (543)	$ (2,048)

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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