Fair Value Disclosures (Level 4 Inv Impair inputs) (Details 2) $ in Thousands	3 Months Ended
	Apr. 30, 2019 USD ($) Homes_sold	Jan. 31, 2019 USD ($) Homes_sold	Oct. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)
Operating communities [Member] | Minimum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price	$ 372	$ 836	$ 470	$ 0	$ 485	$ 381
Sales Pace (in ones)	2	2	4	0	10	7
Fair Value Inputs, Discount Rate	12.00%	12.50%	13.50%	0.00%	16.90%	13.80%
Operating communities [Member] | Maximum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price	$ 1,915	$ 13,495	$ 1,071	$ 0	$ 522	$ 1,029
Sales Pace (in ones)	19	12	23	0	16	10
Fair Value Inputs, Discount Rate	26.00%	15.80%	16.30%	0.00%	16.90%	19.00%
Operating communities [Member] | Minimum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price				$ 10
Operating communities [Member] | Maximum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price				$ 155