Supplemental Guarantor Information (Level 4 IS) (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Supplemental Condensed Consolidating Statement of Operations
Revenues	$ 2,455,238	$ 1,913,353	$ 1,599,199	$ 1,175,468	$ 2,027,907	$ 1,502,909	$ 1,363,512	$ 920,730	$ 7,143,258	$ 5,815,058	$ 5,169,508
Cost of revenues									5,673,007	4,562,303	4,144,065
Selling, general and administrative									684,035	605,572	533,118
Total									6,357,042	5,167,875	4,677,183
Income (loss) from operations									786,216	647,183	492,325
Other [Abstract]
Income (loss) from unconsolidated entities									85,240	116,066	40,748
Other income - net									62,460	51,062	55,954
Intercompany interest income									0	0	0
Interest Expense									0	0	0
Loss from subsidiaries									0	0	0
Income (loss) before income tax benefit	396,473	253,097	152,748	131,598	301,747	203,574	199,209	109,781	933,916	814,311	589,027
Income tax provision									185,765	278,816	206,932
Net income	$ 310,976	$ 193,258	$ 111,810	$ 132,107	$ 191,878	$ 148,563	$ 124,638	$ 70,416	748,151	535,495	382,095
Other Comprehensive Income (Loss), Net of Tax									2,926	1,426	(827)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									751,077	536,921	381,268
Eliminations [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues									(209,706)	(190,223)	(176,533)
Cost of revenues									(58,708)	(75,401)	(63,708)
Selling, general and administrative									(111,472)	(108,634)	(101,652)
Total									(170,180)	(184,035)	(165,360)
Income (loss) from operations									(39,526)	(6,188)	(11,173)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net									34,849	3,161	3,388
Intercompany interest income									(148,155)	(160,779)	(145,828)
Interest Expense									145,455	169,066	153,613
Loss from subsidiaries									(1,040,056)	(946,574)	(608,611)
Income (loss) before income tax benefit									(1,047,433)	(941,314)	(608,611)
Income tax provision									(208,345)	(322,306)	(213,805)
Net income									(839,088)	(619,008)	(394,806)
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									(839,088)	(619,008)	(394,806)
Toll Brothers Inc. [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues
Cost of revenues
Selling, general and administrative									77	58	75
Total									77	58	75
Income (loss) from operations									(77)	(58)	(75)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net										10,574	9,501
Intercompany interest income
Interest Expense
Loss from subsidiaries									933,993	803,795	579,601
Income (loss) before income tax benefit									933,916	814,311	589,027
Income tax provision									185,765	278,816	206,932
Net income									748,151	535,495	382,095
Other Comprehensive Income (Loss), Net of Tax									2,926	1,426	(858)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									751,077	536,921	381,237
Subsidiary Issuer [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues
Cost of revenues
Selling, general and administrative									3,162	4,033	3,809
Total									3,162	4,033	3,809
Income (loss) from operations									(3,162)	(4,033)	(3,809)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net
Intercompany interest income									142,084	156,366	145,828
Interest Expense									(138,922)	(162,882)	(151,410)
Loss from subsidiaries
Income (loss) before income tax benefit									0	(10,549)	(9,391)
Income tax provision										(3,612)	(3,299)
Net income									0	(6,937)	(6,092)
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									0	(6,937)	(6,092)
Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues									6,899,891	5,668,610	4,984,356
Cost of revenues									5,427,753	4,414,461	3,919,729
Selling, general and administrative									709,265	633,000	556,558
Total									6,137,018	5,047,461	4,476,287
Income (loss) from operations									762,873	621,149	508,069
Other [Abstract]
Income (loss) from unconsolidated entities									44,646	12,271	16,913
Other income - net									30,561	26,653	25,609
Intercompany interest income									1,649	48
Interest Expense									(4,422)	(4,365)
Loss from subsidiaries									106,063	142,779	29,010
Income (loss) before income tax benefit									941,370	798,535	579,601
Income tax provision									187,248	273,418	203,614
Net income									754,122	525,117	375,987
Other Comprehensive Income (Loss), Net of Tax											31
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									754,122	525,117	376,018
Non-Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues									453,073	336,671	361,685
Cost of revenues									303,962	223,243	288,044
Selling, general and administrative									83,003	77,115	74,328
Total									386,965	300,358	362,372
Income (loss) from operations									66,108	36,313	(687)
Other [Abstract]
Income (loss) from unconsolidated entities									40,594	103,795	23,835
Other income - net									(2,950)	10,674	17,456
Intercompany interest income									4,422	4,365
Interest Expense									(2,111)	(1,819)	(2,203)
Loss from subsidiaries
Income (loss) before income tax benefit									106,063	153,328	38,401
Income tax provision									21,097	52,500	13,490
Net income									84,966	100,828	24,911
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									$ 84,966	$ 100,828	$ 24,911