Fair Value Measurements Fair Value Measurements (Additional Quantitative Information about Unobservable Inputs) (Details) (Auction Rate Securities [Member], Discounted Cash Flow Valuation Technique [Member])	12 Months Ended
	Nov. 30, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidity risk premium	4.00%
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of earning the maximum rate until maturity	0.20%
Probability of principal return prior to maturity	75.40%
Probability of default	4.20%
Recovery rate in default	50.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of earning the maximum rate until maturity	10.70%
Probability of principal return prior to maturity	94.90%
Probability of default	24.50%
Recovery rate in default	70.00%
Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of earning the maximum rate until maturity	1.90%
Probability of principal return prior to maturity	86.70%
Probability of default	11.50%
Recovery rate in default	56.50%