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Income Taxes (Details Textual) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Income Taxes (Textual) [Abstract]
Tax impact realization likelihood percentage	50.00%
Deferred tax assets unrealized currency losses		$ 4,515
Interest and penalties		$ 1,396

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on foreign currency transactions.

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