Investments in Unconsolidated Entities (Details 5) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2021	Jul. 31, 2021	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Condensed Statements of Operations:
Income before income taxes	$ 499,689	$ 303,395	$ 169,826	$ 127,405	$ 266,991	$ 151,865	$ 102,113	$ 65,932	$ 1,100,315	$ 586,901	$ 787,170
Income tax provision									266,688	140,277	197,163
Income (loss) attributable to noncontrolling interest									(6,770)	(10)	(19)
Net income	$ 374,330	$ 234,932	$ 127,866	$ 96,499	$ 199,317	$ 114,761	$ 75,670	$ 56,876	833,627	446,624	590,007
Income from unconsolidated entities									74,035	948	24,868
Land Development Joint Venture [Member]
Condensed Statements of Operations:
Revenues									110,330	87,174	261,677
Cost of revenues									81,207	64,810	246,980
Other expenses									2,622	2,948	4,752
Total expenses									83,829	67,758	251,732
Gain on disposition of loans and REO									0	0	0
Income before income taxes									26,501	19,416	9,945
Other income (expense)									8,807	3,061	3,079
Income tax provision									258	188	193
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest										22,289	12,831
Income (loss) attributable to noncontrolling interest										0	0
Net income									35,050	22,289	12,831
Income from unconsolidated entities									18,155	11,412	6,160
Net Income Before Noncontrolling Interest									35,308	22,477	13,024
Home Building Joint Ventures, Total [Member]
Condensed Statements of Operations:
Revenues									88,534	139,587	374,587
Cost of revenues									105,436	124,899	323,764
Other expenses									4,887	15,731	24,633
Total expenses									110,323	140,630	348,397
Gain on disposition of loans and REO									0	0	0
Income before income taxes									(21,789)	(1,043)	26,190
Other income (expense)									317	536	6,144
Income tax provision									(875)	(254)	457
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest										(253)	31,877
Income (loss) attributable to noncontrolling interest										0	0
Net income									(20,597)	(253)	31,877
Income from unconsolidated entities									(241)	(3,424)	17,004
Net Income Before Noncontrolling Interest									(21,472)	(507)	32,334
Rental Joint Ventures, including Trusts i and II [Member]
Condensed Statements of Operations:
Revenues									141,373	111,122	99,401
Cost of revenues									61,278	37,770	68,502
Other expenses									143,050	117,419	58,928
Total expenses									204,328	155,189	127,430
Gain on disposition of loans and REO									0	0	0
Income before income taxes									(62,955)	(44,067)	(28,029)
Other income (expense)									177,777	(448)	16,651
Income tax provision									(824)		0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest										(44,515)	(11,378)
Income (loss) attributable to noncontrolling interest										0	0
Net income									115,646	(44,515)	(11,378)
Income from unconsolidated entities									53,792	(9,389)	(824)
Net Income Before Noncontrolling Interest									114,822	(44,515)	(11,378)
Gibraltar Joint Ventures [Member]
Condensed Statements of Operations:
Revenues									21,357	26,781	21,377
Cost of revenues									10,506	15,762	13,234
Other expenses									1,947	1,505	1,880
Total expenses									12,453	17,267	15,114
Gain on disposition of loans and REO									(4,109)	1,053	4,383
Income before income taxes									4,795	10,567	10,646
Other income (expense)									0		12,793
Income tax provision									0	0	0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest										10,567	23,439
Income (loss) attributable to noncontrolling interest										48	(9,593)
Net income									4,795	10,615	13,846
Income from unconsolidated entities									2,329	2,349	2,528
Net Income Before Noncontrolling Interest									4,795	10,567	23,439
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Condensed Statements of Operations:
Revenues									361,594	364,664	757,042
Cost of revenues									258,427	243,241	652,480
Other expenses									152,506	137,603	90,193
Total expenses									410,933	380,844	742,673
Gain on disposition of loans and REO									(4,109)	1,053	(4,383)
Income before income taxes									(53,448)	(15,127)	18,752
Other income (expense)									186,901	3,149	38,667
Income tax provision									(1,441)	(66)	650
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest										(11,912)	56,769
Income (loss) attributable to noncontrolling interest										48	(9,593)
Net income									134,894	(11,864)	47,176
Income from unconsolidated entities									74,035	948	24,868
Net Income Before Noncontrolling Interest									$ 133,453	$ (11,978)	$ 57,419