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Fair Value Disclosures (Policies)
3 Months Ended
Aug. 31, 2013
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments, Policy [Policy Text Block]
Adjustments to the fair value of available-for-sale securities are recorded as increases or decreases, net of income taxes, within accumulated other comprehensive gain (loss) in stockholders’ equity. The cost of securities sold is based on the specific identification method; realized gains and losses resulting from such sales are included in the Condensed Consolidated Statements of Comprehensive Income within "Other, net".