Basis of Presentation and Significant Accounting Policies (Narratives) (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	Jan. 29, 2013	Aug. 31, 2013 Rate	Aug. 31, 2012 Rate	Aug. 31, 2013 Rate	Aug. 31, 2012 Rate	Nov. 30, 2012
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued	36.5297
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		5,200,000	8,500,000	5,200,000
Cash equivalents		$ 260,800,000		$ 260,800,000		$ 396,300,000
Restricted cash		41,631,000		41,631,000		42,362,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		27,300,000	3,300,000	11,800,000	(66,700,000)
Homebuyer Closing Costs Allowances		2,600,000	3,400,000	6,900,000	11,300,000
Homebuyer Closing Costs Allowances Percentage of Housing Revenues		0.50%	0.80%	0.50%	1.20%
Convertible senior notes due February 1, 2019 at 1.375%
Debt Instrument [Line Items]
Debt instrument, face amount	$ 230,000,000
Debt Instrument, Interest Rate, Stated Percentage	1.375%