Shareholders' Equity (Exercise Price Ranges, Characteristics Of Outstanding And Exercisable Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	$ 8.82
Number of Shares, Options Outstanding	7,743	9,876
Weighted Average Exercise Price, Options Outstanding	$ 19.77	$ 17.54
8.82-14.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	$ 8.82
15.29-19.53 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	$ 15.29
19.54-20.78 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	$ 19.54
20.79-21.60 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	$ 20.79
21.61-29.64 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	$ 21.61
Options Outstanding [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Outstanding	7,743
Weighted Average Remaining Life, Options Outstanding (in years)	3.56
Weighted Average Exercise Price, Options Outstanding	$ 19.77
Options Outstanding [Member] | 8.82-14.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Outstanding	1,668
Weighted Average Remaining Life, Options Outstanding (in years)	2.98
Weighted Average Exercise Price, Options Outstanding	$ 13.52
Options Outstanding [Member] | 15.29-19.53 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Outstanding	1,523
Weighted Average Remaining Life, Options Outstanding (in years)	2.87
Weighted Average Exercise Price, Options Outstanding	$ 16.88
Options Outstanding [Member] | 19.54-20.78 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Outstanding	1,602
Weighted Average Remaining Life, Options Outstanding (in years)	2.85
Weighted Average Exercise Price, Options Outstanding	$ 20.42
Options Outstanding [Member] | 20.79-21.60 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Outstanding	1,673
Weighted Average Remaining Life, Options Outstanding (in years)	3.92
Weighted Average Exercise Price, Options Outstanding	$ 21.36
Options Outstanding [Member] | 21.61-29.64 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Outstanding	1,277
Weighted Average Remaining Life, Options Outstanding (in years)	5.58
Weighted Average Exercise Price, Options Outstanding	$ 28.48
Options Exercisable [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Exercisable	4,575
Weighted Average Exercise Price, Options Exercisable	$ 18.31
Options Exercisable [Member] | 8.82-14.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Exercisable	1,176
Weighted Average Exercise Price, Options Exercisable	$ 13.39
Options Exercisable [Member] | 15.29-19.53 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Exercisable	1,088
Weighted Average Exercise Price, Options Exercisable	$ 16.68
Options Exercisable [Member] | 19.54-20.78 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Exercisable	1,268
Weighted Average Exercise Price, Options Exercisable	$ 20.42
Options Exercisable [Member] | 20.79-21.60 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Exercisable	805
Weighted Average Exercise Price, Options Exercisable	$ 21.41
Options Exercisable [Member] | 21.61-29.64 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options Exercisable	238
Weighted Average Exercise Price, Options Exercisable	$ 28.31