Available Domestic and Foreign Loss Carryforwards (Detail) (USD $) In Millions, unless otherwise specified	May 31, 2012
Operating Loss Carryforwards [Line Items]
Net Operating Losses	$ 247
Expiring in 2013
Operating Loss Carryforwards [Line Items]
Net Operating Losses	0
2014
Operating Loss Carryforwards [Line Items]
Net Operating Losses	8
2015
Operating Loss Carryforwards [Line Items]
Net Operating Losses	3
2016
Operating Loss Carryforwards [Line Items]
Net Operating Losses	8
Expire in 2017 to 2032
Operating Loss Carryforwards [Line Items]
Net Operating Losses	131
Indefinite
Operating Loss Carryforwards [Line Items]
Net Operating Losses	$ 97

The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 48

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant