Earnings Per Share (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	8 Months Ended	9 Months Ended
Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2010	Aug. 31, 2011
Earnings for basic earnings per common share:
Net earnings	$ 54,010	$ 42,625	$ 162,817	$ 240,755
Net (loss) earnings to noncontrolling interests	(14,265)	(2,129)	1,865	4,523
Net earnings to common shareholders	68,275	44,754	160,952	236,232
Less: Allocation of earnings to participating securities	3,410	1,674	5,452	11,136
Net earnings available to common shareholders	64,865	43,080	155,500	225,096
Earnings for diluted earnings per common share:
Net earnings	54,010	42,625	162,817	240,755
Net (loss) earnings to noncontrolling interests	(14,265)	(2,129)	1,865	4,523
Net earnings to common shareholders	68,275	44,754	160,952	236,232
Add: Convertible preferred stock dividends	1,016		2,708	3,047
Less: Allocation of earnings to participating securities	3,415	1,674	5,465	11,116
Net earnings available to common shareholders	$ 65,876	$ 43,080	$ 158,195	$ 228,163
Shares
Average common shares used in basic computation	218,426	195,601	196,943	209,544
Stock options	5	11	14	9
Mandatorily redeemable convertible preferred stock	4,110		4,105	4,108
Convertible debt	0	0	0	0
Average common shares used in diluted computation	222,541	195,612	201,062	213,661
Earnings per common share
Basic	$ 0.30	$ 0.22	$ 0.79	$ 1.07
Diluted	$ 0.30	$ 0.22	$ 0.79	$ 1.07

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