Summary Consolidated Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Quarterly Summary of Income Statement Data [Abstract]
Revenue from Contract with Customer, Including Assessed Tax					$ 2,455,238	$ 1,913,353	$ 1,599,199	$ 1,175,468	$ 7,223,966	$ 7,143,258	$ 5,815,058
Gross Profit					524,487	403,734	301,042	240,988
Income before income taxes	$ 272,649	$ 186,916	$ 176,159	$ 151,446	396,473	253,097	152,748	131,598	787,170	933,916	814,311
Net income	$ 202,315	$ 146,318	$ 129,324	$ 112,050	$ 310,976	$ 193,258	$ 111,810	$ 132,107	$ 590,007	$ 748,151	$ 535,495
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 1.43	$ 1.01	$ 0.88	$ 0.76	$ 2.10	$ 1.28	$ 0.73	$ 0.85	$ 4.07	$ 4.92	$ 3.30
Earnings Per Share, Diluted	$ 1.41	$ 1.00	$ 0.87	$ 0.76	$ 2.08	$ 1.26	$ 0.72	$ 0.83	$ 4.03	$ 4.85	$ 3.17
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic weighted-average shares	141,909	144,750	146,622	146,751	148,066	151,257	152,731	155,882	145,008	151,984	162,222
Weighted Average Number of Shares Outstanding, Diluted	143,567	146,275	148,129	148,032	149,603	153,173	155,129	158,897	146,501	154,201	169,487
Home Building [Member]
Quarterly Summary of Income Statement Data [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,292,044	$ 1,756,970	$ 1,712,057	$ 1,319,308					$ 7,080,379	$ 7,143,258	$ 5,815,058
Gross Profit	431,477	355,215	337,710	277,063
Land [Member]
Quarterly Summary of Income Statement Data [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	86,956	8,721	4,037	43,873					$ 143,587	$ 0	$ 0
Gross Profit	$ 658	$ 2,489	$ 1,116	$ 9,620