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Note 17. Income Taxes (Detail) - Interest related to Unrecognized Tax Benefits (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Aug. 19, 2011	May 31, 2012	May 31, 2011	May 31, 2010
Interest included in provision for income taxes		$ 2	$ 70	$ 33
Included in Provision for Income Taxes [Member]
Interest included in provision for income taxes	$ 55	$ 278	$ 309	$ 122

Interest expense on all other items not previously classified. For example, includes dividends associated with redeemable preferred stock of a subsidiary that is treated as a liability in the parent's consolidated balance sheet.

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