XML 27 R47.htm IDEA: XBRL DOCUMENT

Income Taxes - Additional Information (Detail)	6 Months Ended
Income Taxes - Additional Information (Detail)	Nov. 30, 2012	Nov. 30, 2011
Income Taxes [Line Items]
Effective income tax rate	32.70%	32.90%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References+ Details