Supplemental Guarantor Information (Level 4 IS) (Details 2) - USD ($) $ 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
Supplemental Condensed Consolidating Statement of Operations
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
Cost of Goods and Services Sold									5,808,618	5,673,007	4,562,303
Selling, general and administrative									734,548	684,035	605,572
Total										6,357,042	5,167,875
Income (loss) from operations									680,800	786,216	647,183
Other [Abstract]
Income (loss) from unconsolidated entities									24,868	85,240	116,066
Other income - net									81,502	62,460	51,062
Intercompany interest income									0	0	0
Interest Expense									0	0	0
Loss from subsidiaries									0	0	0
Income (loss) before income tax benefit	$ 272,649	$ 186,916	$ 176,159	$ 151,446	396,473	253,097	152,748	131,598	787,170	933,916	814,311
Income tax provision									197,163	185,765	278,816
Net income	202,315	146,318	129,324	112,050	$ 310,976	$ 193,258	$ 111,810	$ 132,107	590,007	748,151	535,495
Other Comprehensive Income (Loss), Net of Tax									(6,525)	2,926	1,426
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									583,482	751,077	536,921
Toll Brothers Inc. [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax									0
Cost of Goods and Services Sold									0
Selling, general and administrative									542	77	58
Total										77	58
Income (loss) from operations									(542)	(77)	(58)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net											10,574
Intercompany interest income
Interest Expense
Loss from subsidiaries									787,712	933,993	803,795
Income (loss) before income tax benefit									787,170	933,916	814,311
Income tax provision									197,163	185,765	278,816
Net income									590,007	748,151	535,495
Other Comprehensive Income (Loss), Net of Tax									(6,525)	2,926	1,426
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									583,482	751,077	536,921
Subsidiary Issuer [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax									0
Cost of Goods and Services Sold									0
Selling, general and administrative									2,715	3,162	4,033
Total										3,162	4,033
Income (loss) from operations									(2,715)	(3,162)	(4,033)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net
Intercompany interest income									135,087	142,084	156,366
Interest Expense									(132,372)	(138,922)	(162,882)
Loss from subsidiaries
Income (loss) before income tax benefit									0	0	(10,549)
Income tax provision											(3,612)
Net income									0	0	(6,937)
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									0	0	(6,937)
Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax									7,093,521	6,899,891	5,668,610
Cost of Goods and Services Sold									5,655,023	5,427,753	4,414,461
Selling, general and administrative									775,030	709,265	633,000
Total										6,137,018	5,047,461
Income (loss) from operations									663,468	762,873	621,149
Other [Abstract]
Income (loss) from unconsolidated entities									12,930	44,646	12,271
Other income - net									48,052	30,561	26,653
Intercompany interest income									2,616	1,649	48
Interest Expense									(5,781)	(4,422)	(4,365)
Loss from subsidiaries									66,427	106,063	142,779
Income (loss) before income tax benefit									787,712	941,370	798,535
Income tax provision									197,298	187,248	273,418
Net income									590,414	754,122	525,117
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									590,414	754,122	525,117
Non-Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax									360,673	453,073	336,671
Cost of Goods and Services Sold									259,562	303,962	223,243
Selling, general and administrative									75,905	83,003	77,115
Total										386,965	300,358
Income (loss) from operations									25,206	66,108	36,313
Other [Abstract]
Income (loss) from unconsolidated entities									11,938	40,594	103,795
Other income - net									26,352	(2,950)	10,674
Intercompany interest income									5,781	4,422	4,365
Interest Expense									(2,850)	(2,111)	(1,819)
Loss from subsidiaries
Income (loss) before income tax benefit									66,427	106,063	153,328
Income tax provision									16,637	21,097	52,500
Net income									49,790	84,966	100,828
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									49,790	84,966	100,828
Eliminations [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax									(230,228)	(209,706)	(190,223)
Cost of Goods and Services Sold									(105,967)	(58,708)	(75,401)
Selling, general and administrative									(119,644)	(111,472)	(108,634)
Total										(170,180)	(184,035)
Income (loss) from operations									(4,617)	(39,526)	(6,188)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net									7,098	34,849	3,161
Intercompany interest income									(143,484)	(148,155)	(160,779)
Interest Expense									141,003	145,455	169,066
Loss from subsidiaries									(854,139)	(1,040,056)	(946,574)
Income (loss) before income tax benefit									(854,139)	(1,047,433)	(941,314)
Income tax provision									(213,935)	(208,345)	(322,306)
Net income									(640,204)	(839,088)	(619,008)
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									(640,204)	(839,088)	(619,008)
Home Building [Member]
Supplemental Condensed Consolidating Statement of Operations
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
Cost of Goods and Services Sold									5,678,914	5,673,007	4,562,303
Home Building [Member] | Toll Brothers Inc. [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax
Cost of Goods and Services Sold
Home Building [Member] | Subsidiary Issuer [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax
Cost of Goods and Services Sold
Home Building [Member] | Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax									6,980,549
Cost of Goods and Services Sold									5,595,685
Home Building [Member] | Non-Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax									99,830
Cost of Goods and Services Sold									79,400
Home Building [Member] | Eliminations [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax
Cost of Goods and Services Sold									3,829
Land [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax	$ 86,956	$ 8,721	$ 4,037	$ 43,873					143,587	0	0
Cost of Goods and Services Sold									129,704	$ 0	$ 0
Land [Member] | Toll Brothers Inc. [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax
Cost of Goods and Services Sold
Land [Member] | Subsidiary Issuer [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax
Cost of Goods and Services Sold
Land [Member] | Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax									112,972
Cost of Goods and Services Sold									59,338
Land [Member] | Non-Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax									260,843
Cost of Goods and Services Sold									180,162
Land [Member] | Eliminations [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenue from Contract with Customer, Including Assessed Tax									(230,228)
Cost of Goods and Services Sold									$ (109,796)