Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Feb. 29, 2012	Feb. 28, 2011
Earnings for basic earnings per common share:
Net earnings	$ 96,717	$ 102,045
Net earnings to noncontrolling interests	19,581	14,704
Net earnings to common shareholders	77,136	87,341
Less: Allocation of earnings to participating securities	4,643	3,925
Net earnings available to common shareholders	72,493	83,416
Earnings for diluted earnings per common share:
Net earnings	96,717	102,045
Net earnings to noncontrolling interests	19,581	14,704
Net earnings to common shareholders	77,136	87,341
Add: Convertible preferred stock dividends	1,016	1,016
Less: Allocation of earnings to participating securities	4,639	3,907
Net earnings available to common shareholders	$ 73,513	$ 84,450
Shares:
Average common shares used in basic computation	218,049	199,141
Stock options	3	11
Mandatorily redeemable convertible preferred stock	4,110	4,105
Convertible debt
Average common shares used in diluted computation	222,162	203,257
Earnings per common share
Basic	$ 0.33	$ 0.42
Diluted	$ 0.33	$ 0.42