Provision for Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	May 31, 2012	Feb. 28, 2012	May 31, 2011	Feb. 28, 2011	May 31, 2012	May 31, 2011
Reconciliation of Provision of Income Taxes [Line Items]
Effective tax rate	21.00%		22.00%		18.00%	18.00%
Tax benefit primarily related to expiration of statute of limitation		$ 1.8		$ 3.2
Provision primary related to withholding taxes in jurisdiction	3.1
Forecasted annual tax rate					16.00%	26.00%
California deferred tax assets, decrease on election of single sales factor net of federal benefit					10.0
Increase in unrecognized tax benefits	2.9
Gross unrecognized tax benefits	48.2				48.2
Income tax benefit expense realized	$ 29.0				$ 29.0
Foreign jurisdictions statutes of limitations	three to six years