Employee Benefit and Stock Plans (Details Textual) (USD $)	12 Months Ended					12 Months Ended					12 Months Ended			12 Months Ended													12 Months Ended			12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011	Oct. 06, 2011	Oct. 07, 2010	Nov. 30, 2013 Stock Options	Nov. 30, 2013 Restricted Stock	Nov. 30, 2012 Restricted Stock	Nov. 30, 2011 Restricted Stock	Nov. 30, 2010 Restricted Stock	Nov. 30, 2013 Performance Shares	Nov. 30, 2012 Performance Shares	Nov. 30, 2011 Performance Shares	Nov. 30, 2013 Other Equity Awards [Member]	Nov. 30, 2012 Other Equity Awards [Member]	Nov. 30, 2011 Other Equity Awards [Member]	Nov. 30, 2013 Saving Plan	Nov. 30, 2012 Saving Plan	Nov. 30, 2011 Saving Plan	Nov. 30, 2013 Maximum Performance Shares	Nov. 30, 2013 Minimum Performance Shares	Nov. 30, 2013 1988 Employee Stock Plan	Nov. 30, 2009 Phantom Share Units (PSUs)	Nov. 30, 2013 Phantom Share Units (PSUs)	Nov. 30, 2012 Phantom Share Units (PSUs)	Nov. 30, 2011 Phantom Share Units (PSUs)	Nov. 30, 2013 2010 Equity Incentive Plan	Apr. 07, 2011 2010 Equity Incentive Plan	Apr. 01, 2010 2010 Equity Incentive Plan	Nov. 30, 2009 Stock Appreciation Rights (SARs)	Nov. 30, 2013 Stock Appreciation Rights (SARs)	Nov. 30, 2012 Stock Appreciation Rights (SARs)
Employee Benefit and Stock Plans (Textual) [Abstract]
Aggregate cost related to saving plan																	$ 3,500,000	$ 2,600,000	$ 2,800,000
Net assets invested in funds consisting common stock																	7.00%	7.00%	4.00%
Number of shares authorized for issuance of stock based awards to employees																													3,500,000
Grant of stock option, Reduce the plan share capacity per share																													1
Grant of restricted stock, Reduce the Plan share capacity per share																													1.78
Number of additional shares authorized for issuance of stock based awards to employees																												4,000,000
Share Based payments award terms of Award																						15 years					10 years
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition						1 year 9 months 1 day					3 years
Grant, award share percentage																				200.00%	0.00%
Minimum period of restriction imposed on share grant lapse	3 years										3 years												3 years							3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 17.50	$ 16.23	$ 0.00		$ 16.63	$ 16.23
Weighted average per share grant date fair value in dollars per share							$ 16.23	$ 15.81	$ 15.03	$ 15.09	$ 16.39	$ 16.23	$ 0.00
Outstanding at end of year, Shares							219,628	229,724	338,912	402,477	385,049	227,049												0	0	5,556					29,939	29,939
Total unrecognized stock-based compensation expense related to unvested stock option awards						3,400,000	3,500,000				7,300,000
Employee Benefit and Stock Plan (Additional Textual) [Abstract]
Exercises in period, total intrinsic value	1,200,000	100,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	118,208	7,494	0
Intrinsic value of stock options outstanding	32,300,000	18,200,000	1,700,000
Intrinsic value of stock options exercisable	25,500,000	7,800,000	0
Performance-based stock options to purchase aggregate shares of company's common stock				365,000	260,000
Company's common stock at the purchase price per share in dollars per share				$ 6.32	$ 11.06
Grant-date fair value per performance-based stock option in dollars per share				$ 2.54	$ 4.59
Weighted average fair value of stock options granted	$ 6.96	$ 4.18	$ 2.56
Stock-based compensation expense related to stock option grants	2,300,000	5,000,000	5,900,000											3,400,000	1,700,000	1,200,000
Tax shortfall from cancellation of stock awards	700,000	300,000	1,000,000
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	$ 0	$ 0
Shares of common stock held in trust	10,501,844	10,615,934