Summary Consolidated Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Quarterly Summary of Income Statement Data [Abstract]
Revenue from Contract with Customer, Including Assessed Tax									$ 7,077,659	$ 7,223,966	$ 7,143,258
Income before income taxes	$ 266,991	$ 151,865	$ 102,113	$ 65,932	$ 272,649	$ 186,916	$ 176,159	$ 151,446	586,901	787,170	933,916
Net income	$ 199,317	$ 114,761	$ 75,670	$ 56,876	$ 202,315	$ 146,318	$ 129,324	$ 112,050	$ 446,624	$ 590,007	$ 748,151
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 1.57	$ 0.91	$ 0.59	$ 0.41	$ 1.43	$ 1.01	$ 0.88	$ 0.76	$ 3.43	$ 4.07	$ 4.92
Earnings Per Share, Diluted	$ 1.55	$ 0.90	$ 0.59	$ 0.41	$ 1.41	$ 1.00	$ 0.87	$ 0.76	$ 3.40	$ 4.03	$ 4.85
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic weighted-average shares	127,310	126,722	128,205	138,145	141,909	144,750	146,622	146,751	130,095	145,008	151,984
Weighted Average Number of Shares Outstanding, Diluted	128,892	127,399	128,809	139,889	143,567	146,275	148,129	148,032	131,247	146,501	154,201
Home Building [Member]
Quarterly Summary of Income Statement Data [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,495,974	$ 1,627,812	$ 1,516,234	$ 1,297,337	$ 2,292,044	$ 1,756,970	$ 1,712,057	$ 1,319,308	$ 6,937,357	$ 7,080,379	$ 7,143,258
Gross Profit	502,079	341,704	295,256	264,215	478,262	391,653	373,183	303,064
Land [Member]
Quarterly Summary of Income Statement Data [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	49,693	23,677	32,838	34,094	86,956	8,721	4,037	43,873	$ 140,302	$ 143,587	$ 0
Gross Profit	$ 4,798	$ 1,418	$ 6,420	$ 1,812	$ 658	$ 2,489	$ 1,116	$ 9,620