Fair Value Disclosures Fair Value Disclosures (Level 4 Inv Impair inputs) (Details 3) - Operating communities [Member] $ in Thousands	3 Months Ended
	Jul. 31, 2015 USD ($) Homes_sold	Apr. 30, 2015 USD ($) Homes_sold	Jan. 31, 2015 USD ($) Homes_sold	Oct. 31, 2014 USD ($)	Jul. 31, 2014 USD ($)	Apr. 30, 2014 USD ($)	Jan. 31, 2014 USD ($)
Minimum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price	$ 788	$ 527	$ 289	$ 337	$ 698	$ 634	$ 388
Sales Pace (in ones)	4	13	1	7	10	4	21
Fair Value Inputs, Discount Rate	15.50%	17.00%	13.50%	12.50%	15.90%	12.00%	16.60%
Maximum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price	$ 1,298	$ 600	$ 680	$ 902	$ 1,233	$ 760	$ 405
Sales Pace (in ones)	8	25	7	23	22	7	23
Fair Value Inputs, Discount Rate	16.20%	17.00%	16.00%	16.50%	15.90%	15.30%	16.60%