Fair Value Disclosures Fair Value Disclosures (Level 4 Inv Impair inputs) (Details 3) (Details) (Operating communities [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013
Minimum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price	$ 634	$ 388	$ 315	$ 475	$ 0	$ 303
Sales pace (in ones)	4	21	2	2	0	15
Discount rate	12.00%	16.60%	15.00%	15.00%	0.00%	15.30%
Maximum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price	$ 760	$ 405	$ 362	$ 500	$ 0	$ 307
Sales pace (in ones)	7	23	7	2	0	15
Discount rate	15.30%	16.60%	15.00%	15.00%	0.00%	15.30%