Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Income Taxes [Line Items]
Undistributed earnings for non-U.S. subsidiaries	$ 142,500,000
Decrease in valuation allowance	2,500,000
Valuation allowance	5,592,000	8,051,000
Operating loss carryforwards expiration date	2030
Benefits applicable to stock options	8,500,000	30,600,000
Percentage of tax benefit related to settlement	50.00%
Decrease in unrecognized tax benefits	7,700,000
Gross unrecognized tax benefits	44,380,000	36,654,000
Amount of unrecognized tax benefits would affect the effective tax rate upon realization	24,800,000
Federal [Member]
Income Taxes [Line Items]
Operating loss carryforwards	271,800,000
Net operating losses attributable to stock deductions reduce taxes payable	149,100,000
Tax credit carryforwards	75,700,000
Tax credit carryforwards expiration date	2031
Tax credit carryforwards attributable to stock option benefits	73,000,000
State [Member]
Income Taxes [Line Items]
Operating loss carryforwards	233,900,000
Net operating losses attributable to stock deductions reduce taxes payable	136,900,000
Tax credit carryforwards	36,900,000
Tax credit carryforwards attributable to stock option benefits	$ 26,600,000