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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date the equity-based award expires, in CCYY-MM-DD format.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Employee Benefit and Stock Plans (Details Textual) (USD $)	12 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2009	Nov. 30, 2011	Apr. 03, 2014
Employee Benefit and Stock Plan (Additional Textual) [Abstract]
Exercises in period, total intrinsic value	$ 300,000	$ 1,200,000	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	36,665	118,208	7,494
Intrinsic value of stock options outstanding	35,800,000	32,300,000	18,200,000
Intrinsic value of stock options exercisable	31,700,000	25,500,000	7,800,000
Weighted average fair value of stock options granted	$ 5.07	$ 6.96	$ 4.18
Tax shortfall from cancellation of stock awards	1,200,000	700,000	300,000
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	0	0	0
Shares of common stock held in trust	10,335,461	10,501,844
Share Based payments award terms of Award	5 years	5 years	5 years
Stock Options
Employee Benefit and Stock Plans (Textual) [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months 1 day
Total unrecognized stock-based compensation expense related to unvested stock option awards	6,200,000
Employee Benefit and Stock Plan (Additional Textual) [Abstract]
Stock-based compensation expense related to stock option grants	3,000,000	2,300,000	5,000,000
Restricted Stock
Employee Benefit and Stock Plans (Textual) [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	3 years
Minimum period of restriction imposed on share grant lapse	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	$ 15.34	$ 17.50	$ 16.23
Outstanding at end of year, Shares	355,294	219,628	229,724		338,912
Total unrecognized stock-based compensation expense related to unvested stock option awards	4,200,000
Performance Shares
Employee Benefit and Stock Plans (Textual) [Abstract]
Minimum period of restriction imposed on share grant lapse	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	$ 14.62	$ 16.63	$ 16.23
Outstanding at end of year, Shares	628,209	385,049	227,049		0
Total unrecognized stock-based compensation expense related to unvested stock option awards	10,000,000
Other Equity Awards [Member]
Employee Benefit and Stock Plan (Additional Textual) [Abstract]
Stock-based compensation expense related to stock option grants	6,100,000	3,400,000	1,700,000
Maximum \| Performance Shares
Employee Benefit and Stock Plans (Textual) [Abstract]
Grant, award share percentage	200.00%	200.00%	200.00%
Minimum \| Performance Shares
Employee Benefit and Stock Plans (Textual) [Abstract]
Grant, award share percentage	0.00%	0.00%	0.00%
Equity Incentive Twenty Thousand Fourteen Plan [Member] [Member]
Employee Benefit and Stock Plans (Textual) [Abstract]
Number of shares authorized for issuance of stock based awards to employees						4,800,000
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
2010 Equity Incentive Plan
Employee Benefit and Stock Plan (Additional Textual) [Abstract]
Share Based payments award terms of Award	10 years
Stock Appreciation Rights (SARs)
Employee Benefit and Stock Plans (Textual) [Abstract]
Minimum period of restriction imposed on share grant lapse				3 years
Outstanding at end of year, Shares	29,939	29,939	29,939
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	Jul. 31, 2017
Saving Plan
Employee Benefit and Stock Plans (Textual) [Abstract]
Aggregate cost related to saving plan	$ 3,800,000	$ 3,300,000	$ 2,600,000
Net assets invested in funds consisting common stock	6.00%	7.00%	7.00%