Supplemental Guarantor Information (Level 4 IS) (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Oct. 31, 2016
Supplemental Condensed Consolidating Statement of Operations
Revenues	$ 1,363,512	$ 1,115,557	$ 2,284,242	$ 2,044,123	$ 5,169,508
Cost of revenues	1,077,441	870,571	1,810,443	1,582,882	4,144,065
Selling, general and administrative	147,876	128,340	284,971	250,136	535,382
Total	1,225,317	998,911	2,095,414	1,833,018	4,679,447
Income (loss) from operations	138,195	116,646	188,828	211,105	490,061
Other [Abstract]
Income (loss) from unconsolidated entities	45,904	9,118	92,349	17,756	40,748
Other income - net	15,110	14,633	27,813	28,353	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	199,209	140,397	308,990	257,214	589,027
Income tax provision (benefit)	74,571	51,343	113,936	94,980	206,932
Net income (loss)	124,638	89,054	195,054	162,234	382,095
Other Comprehensive Income (Loss), Net of Tax	168	159	337	(101)	(827)
Comprehensive Income (loss), Net of Tax, Attributable to Parent	124,806	89,213	195,391	162,133	381,268
Toll Brothers Inc. [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues
Cost of revenues
Selling, general and administrative	24	10	24	22	75
Total	24	10	24	22	75
Income (loss) from operations	(24)	(10)	(24)	(22)	(75)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net	2,289	2,320	4,682	4,711	9,501
Intercompany interest income
Interest Expense
Income from subsidiaries	196,944	138,087	304,332	252,525	579,601
Income (loss) before income taxes	199,209	140,397	308,990	257,214	589,027
Income tax provision (benefit)	74,571	51,343	113,936	94,980	206,932
Net income (loss)	124,638	89,054	195,054	162,234	382,095
Other Comprehensive Income (Loss), Net of Tax	168	155	337	(132)	(858)
Comprehensive Income (loss), Net of Tax, Attributable to Parent	124,806	89,209	195,391	162,102	381,237
Subsidiary Issuer [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues
Cost of revenues
Selling, general and administrative	997	951	1,965	1,920	3,809
Total	997	951	1,965	1,920	3,809
Income (loss) from operations	(997)	(951)	(1,965)	(1,920)	(3,809)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net
Intercompany interest income	38,557	36,480	75,053	72,977	145,828
Interest Expense	(39,850)	(37,819)	(77,745)	(75,714)	(151,410)
Income from subsidiaries
Income (loss) before income taxes	(2,290)	(2,290)	(4,657)	(4,657)	(9,391)
Income tax provision (benefit)	(868)	(882)	(1,717)	(1,794)	(3,299)
Net income (loss)	(1,422)	(1,408)	(2,940)	(2,863)	(6,092)
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (loss), Net of Tax, Attributable to Parent	(1,422)	(1,408)	(2,940)	(2,863)	(6,092)
Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues	1,324,094	1,090,366	2,239,917	1,874,962	4,984,356
Cost of revenues	1,043,091	853,260	1,767,348	1,478,061	3,919,729
Selling, general and administrative	154,767	134,625	298,648	260,530	558,822
Total	1,197,858	987,885	2,065,996	1,738,591	4,478,551
Income (loss) from operations	126,236	102,481	173,921	136,371	505,805
Other [Abstract]
Income (loss) from unconsolidated entities	3,334	7,336	8,478	10,333	16,913
Other income - net	5,015	5,226	12,266	13,395	27,873
Intercompany interest income
Interest Expense
Income from subsidiaries	62,360	23,043	104,408	92,425	29,010
Income (loss) before income taxes	196,945	138,086	299,073	252,524	579,601
Income tax provision (benefit)	73,647	53,168	110,268	97,272	203,614
Net income (loss)	123,298	84,918	188,805	155,252	375,987
Other Comprehensive Income (Loss), Net of Tax		4		31	31
Comprehensive Income (loss), Net of Tax, Attributable to Parent	123,298	84,922	188,805	155,283	376,018
Nonguarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues	84,002	55,527	129,698	225,750	361,685
Cost of revenues	50,163	20,780	79,634	110,867	288,044
Selling, general and administrative	17,924	17,228	34,872	35,201	74,328
Total	68,087	38,008	114,506	146,068	362,372
Income (loss) from operations	15,915	17,519	15,192	79,682	(687)
Other [Abstract]
Income (loss) from unconsolidated entities	42,570	1,782	83,871	7,423	23,835
Other income - net	4,309	6,346	8,809	10,539	17,456
Intercompany interest income	2,146		2,146
Interest Expense	(291)	(315)	(954)	(563)	(2,203)
Income from subsidiaries
Income (loss) before income taxes	64,649	25,332	109,064	97,081	38,401
Income tax provision (benefit)	24,285	9,744	40,211	37,396	13,490
Net income (loss)	40,364	15,588	68,853	59,685	24,911
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (loss), Net of Tax, Attributable to Parent	40,364	15,588	68,853	59,685	24,911
Eliminations [Member]
Supplemental Condensed Consolidating Statement of Operations
Revenues	(44,584)	(30,336)	(85,373)	(56,589)	(176,533)
Cost of revenues	(15,813)	(3,469)	(36,539)	(6,046)	(63,708)
Selling, general and administrative	(25,836)	(24,474)	(50,538)	(47,537)	(101,652)
Total	(41,649)	(27,943)	(87,077)	(53,583)	(165,360)
Income (loss) from operations	(2,935)	(2,393)	1,704	(3,006)	(11,173)
Other [Abstract]
Income (loss) from unconsolidated entities
Other income - net	3,497	741	2,056	(292)	3,388
Intercompany interest income	(40,703)	(36,480)	(77,199)	(72,977)	(145,828)
Interest Expense	40,141	38,134	78,699	76,277	153,613
Income from subsidiaries	(259,304)	(161,130)	(408,740)	(344,950)	(608,611)
Income (loss) before income taxes	(259,304)	(161,128)	(403,480)	(344,948)	(608,611)
Income tax provision (benefit)	(97,064)	(62,030)	(148,762)	(132,874)	(213,805)
Net income (loss)	(162,240)	(99,098)	(254,718)	(212,074)	(394,806)
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (loss), Net of Tax, Attributable to Parent	$ (162,240)	$ (99,098)	$ (254,718)	$ (212,074)	$ (394,806)