XML 43 R45.htm IDEA: XBRL DOCUMENT v2.4.0.8
Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Income Taxes [Line Items]      
Uncertain tax positions, reserves     $ 550,000
Uncertain tax position, tax rate     33.70%
Effective tax rate 34.90% 34.30% 35.50%