Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	May 31, 2012
Income Taxes [Line Items]
Decrease in unrecognized income tax benefits, interest, and penalties related to non-U.S. governmental tax audit	$ (20.8)

The amount the liability recorded for the income tax examination increased or decreased in the current year/accounting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Name:	us-gaap_IncomeTaxExaminationIncreaseDecreaseInLiabilityFromPriorYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant