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Other Property - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 1,149	$ 1,157	$ 1,020

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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