Supplemental Guarantor Information (Level 4 IS) (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Oct. 31, 2016
Supplemental Condensed Consolidating Statement of Operations
Revenues	$ 1,502,909	$ 1,269,934	$ 3,787,151	$ 3,314,057	$ 5,169,508
Cost of revenues	1,176,028	991,416	2,986,471	2,574,298	4,144,065
Selling, general and administrative	155,212	134,984	440,183	385,120	535,382
Total	1,331,240	1,126,400	3,426,654	2,959,418	4,679,447
Income (loss) from operations	171,669	143,534	360,497	354,639	490,061
Other [Abstract]
Income (loss) from unconsolidated entities	19,925	4,998	112,274	22,754	40,748
Other income - net	11,980	15,121	39,793	43,474	58,218
Intercompany interest income	0	0	0	0	0
Interest Expense	0	0	0	0	0
Income from subsidiaries	0	0	0	0	0
Income (loss) before income taxes	203,574	163,653	512,564	420,867	589,027
Income tax provision (benefit)	55,011	58,170	168,947	153,150	206,932
Net income (loss)	148,563	105,483	343,617	267,717	382,095
Other Comprehensive Income (Loss), Net of Tax	167	155	504	54	(827)
Comprehensive Income (loss), Net of Tax, Attributable to Parent	148,730	105,638	344,121	267,771	381,268
Toll Brothers Inc. [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues
Cost of revenues
Selling, general and administrative	21	27	45	49	75
Total	21	27	45	49	75
Income (loss) from operations	(21)	(27)	(45)	(49)	(75)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net	2,367	2,395	7,049	7,106	9,501
Intercompany interest income
Interest Expense
Income from subsidiaries	201,228	161,285	505,560	413,810	579,601
Income (loss) before income taxes	203,574	163,653	512,564	420,867	589,027
Income tax provision (benefit)	55,011	58,170	168,947	153,150	206,932
Net income (loss)	148,563	105,483	343,617	267,717	382,095
Other Comprehensive Income (Loss), Net of Tax	167	155	504	23	(858)
Comprehensive Income (loss), Net of Tax, Attributable to Parent	148,730	105,638	344,121	267,740	381,237
Subsidiary Issuer [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues
Cost of revenues
Selling, general and administrative	1,045	937	3,010	2,857	3,809
Total	1,045	937	3,010	2,857	3,809
Income (loss) from operations	(1,045)	(937)	(3,010)	(2,857)	(3,809)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net
Intercompany interest income	41,111	36,370	116,164	109,347	145,828
Interest Expense	(42,433)	(37,800)	(120,178)	(113,514)	(151,410)
Income from subsidiaries
Income (loss) before income taxes	(2,367)	(2,367)	(7,024)	(7,024)	(9,391)
Income tax provision (benefit)	(839)	(911)	(2,556)	(2,705)	(3,299)
Net income (loss)	(1,528)	(1,456)	(4,468)	(4,319)	(6,092)
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (loss), Net of Tax, Attributable to Parent	(1,528)	(1,456)	(4,468)	(4,319)	(6,092)
Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues	1,459,115	1,248,474	3,699,032	3,123,436	4,984,356
Cost of revenues	1,128,705	973,493	2,896,053	2,451,554	3,919,729
Selling, general and administrative	163,074	141,519	461,722	402,049	558,822
Total	1,291,779	1,115,012	3,357,775	2,853,603	4,478,551
Income (loss) from operations	167,336	133,462	341,257	269,833	505,805
Other [Abstract]
Income (loss) from unconsolidated entities	2,746	5,835	11,224	16,168	16,913
Other income - net	9,389	8,109	21,655	21,504	27,873
Intercompany interest income	48		48
Interest Expense	(3,370)		(3,370)
Income from subsidiaries	25,078	13,880	129,486	106,305	29,010
Income (loss) before income taxes	201,227	161,286	500,300	413,810	579,601
Income tax provision (benefit)	71,787	62,086	182,055	159,358	203,614
Net income (loss)	129,440	99,200	318,245	254,452	375,987
Other Comprehensive Income (Loss), Net of Tax				31	31
Comprehensive Income (loss), Net of Tax, Attributable to Parent	129,440	99,200	318,245	254,483	376,018
Nonguarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues	94,422	56,457	224,120	282,207	361,685
Cost of revenues	65,595	24,085	145,229	134,952	288,044
Selling, general and administrative	20,083	18,198	54,955	53,399	74,328
Total	85,678	42,283	200,184	188,351	362,372
Income (loss) from operations	8,744	14,174	23,936	93,856	(687)
Other [Abstract]
Income (loss) from unconsolidated entities	17,179	(837)	101,050	6,586	23,835
Other income - net	673	3,625	9,482	14,164	17,456
Intercompany interest income	1,224		3,370
Interest Expense	(374)	(714)	(1,328)	(1,277)	(2,203)
Income from subsidiaries
Income (loss) before income taxes	27,446	16,248	136,510	113,329	38,401
Income tax provision (benefit)	9,462	6,249	49,674	43,645	13,490
Net income (loss)	17,984	9,999	86,836	69,684	24,911
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (loss), Net of Tax, Attributable to Parent	17,984	9,999	86,836	69,684	24,911
Eliminations [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues	(50,628)	(34,997)	(136,001)	(91,586)	(176,533)
Cost of revenues	(18,272)	(6,162)	(54,811)	(12,208)	(63,708)
Selling, general and administrative	(29,011)	(25,697)	(79,549)	(73,234)	(101,652)
Total	(47,283)	(31,859)	(134,360)	(85,442)	(165,360)
Income (loss) from operations	(3,345)	(3,138)	(1,641)	(6,144)	(11,173)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net	(449)	992	1,607	700	3,388
Intercompany interest income	(42,383)	(36,370)	(119,582)	(109,347)	(145,828)
Interest Expense	46,177	38,514	124,876	114,791	153,613
Income from subsidiaries	(226,306)	(175,165)	(635,046)	(520,115)	(608,611)
Income (loss) before income taxes	(226,306)	(175,167)	(629,786)	(520,115)	(608,611)
Income tax provision (benefit)	(80,410)	(67,424)	(229,173)	(200,298)	(213,805)
Net income (loss)	(145,896)	(107,743)	(400,613)	(319,817)	(394,806)
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (loss), Net of Tax, Attributable to Parent	$ (145,896)	$ (107,743)	$ (400,613)	$ (319,817)	$ (394,806)