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Mortgages and Notes Payable (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended		6 Months Ended					6 Months Ended
	Feb. 29, 2012	May 31, 2012	Nov. 30, 2011	May 31, 2012 Senior notes due 2014 at 5 3/4% [Member]	May 31, 2012 Senior notes due 2015 at 5 7/8% [Member]	May 31, 2012 Senior notes due 2015 at 6 1/4% [Member]	May 31, 2012 Senior notes due 2017 at 9.10% [Member]	May 31, 2012 Senior notes due 2018 at 7 1/4% [Member]	May 31, 2012 Senior notes due 2020 at 8.00% [Member]	Feb. 07, 2012 Senior notes due 2020 at 8.00% [Member]
Mortgages and Notes Payable (Additional Textual) [Abstract]
Senior notes							$ 265.0		$ 350.0
Senior notes, rate				5.75%	5.875%	6.25%	9.10%	7.25%	8.00%
Maturity Date									Mar. 15, 2020
Percentage of price equal to the redemption value of senior notes									100.00%
Total consideration paid to purchase the notes		340.5		56.3	130.0	153.7
Percentage of principal amount for purchase of notes if change in control										101.00%
Mortgages and Notes Payable (Textual) [Abstract]
Letter of credit facility outstanding		61.8	63.8
Loss on early redemption of debt	2.0
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2012		15.9
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2013		2.4
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2014		193.5
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2015		465.8
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2016		0
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due thereafter		$ 905.2

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