Contingencies - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended
May 31, 2012 USD ($)	May 31, 2012 EUR (€)	Aug. 31, 2012 USD ($)
Loss Contingencies [Line Items]
Accrual amount for contingencies	$ 25.5		$ 28.2
Penalty paid	17.3
Aggregate amount paid to settle civil claims	5.6
Lawsuit seeking amount for damages		€ 30

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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

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-Name Accounting Standards Codification

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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