Employee Benefit and Stock Plans (Details 2)	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Assumptions of Black-Scholes option-pricing model
Risk-free interest rate	1.30%	0.70%	0.90%
Expected volatility factor	52.30%	65.60%	65.60%
Expected dividend yield	0.60%	1.90%	3.90%
Expected term	5 years	5 years	5 years