Provision For Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Feb. 28, 2012	Feb. 28, 2011	Feb. 28, 2009
Provision For Income Taxes [Abstract]
Effective tax rate	14.00%	11.00%
Tax benefit primarily related to the expiration of a statute of limitation	$ 1.8	$ 2.3
Gross unrecognized tax benefits	45.3
Increase in unrecognized tax benefits	1.7
Income tax benefit expense realized	26.9
Forecasted annual tax rate	21.00%	30.00%
California deferred tax assets, decrease on election of single sales factor net of federal benefit			$ 1.1
Foreign jurisdictions statutes of limitations	three to six years