Fair Value Disclosures (Level 4 Inv Impair inputs) (Details 2) - Operating communities [Member] $ in Thousands	3 Months Ended
	Jul. 31, 2020 USD ($) Homes_sold	Apr. 30, 2020 USD ($) Homes_sold	Jan. 31, 2020 USD ($) Homes_sold	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)
Minimum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price		$ 613		$ 478	$ 530	$ 372	$ 836
Sales Pace (in ones)		9		2	2	2	2
Fair Value Inputs, Discount Rate		14.30%		13.80%	7.80%	12.00%	12.50%
Maximum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price		$ 789		$ 857	$ 1,113	$ 1,915	$ 13,495
Sales Pace (in ones)		9		5	9	19	12
Fair Value Inputs, Discount Rate		14.30%		14.50%	13.00%	26.00%	15.80%