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Investments in Unconsolidated Entities (Details Textual)	3 Months Ended			6 Months Ended
	Apr. 30, 2019 USD ($) joint_ventures Homes_sold rental_units home_sites	Apr. 30, 2018 USD ($) Homes_sold home_sites	Jan. 31, 2018 USD ($)	Apr. 30, 2019 USD ($) joint_ventures Homes_sold rental_units home_sites	Apr. 30, 2018 USD ($) Homes_sold home_sites	Oct. 31, 2018 USD ($)	Nov. 01, 2017 USD ($)
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Summarized Financial Information, Revenue	$ 178,388,000	$ 82,663,000		$ 331,617,000	$ 276,284,000
Revenues	1,716,094,000	1,599,199,000		3,079,275,000	2,774,667,000
Land sales earnings, net		$ 2,587,000			$ 3,287,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	390,085,000			390,085,000		$ 431,813,000
Line of Credit Facility, Maximum Borrowing Capacity	1,572,224,000			1,572,224,000
Long-term Line of Credit	1,248,835,000			1,248,835,000
Other Commitment	$ 30,872,000			$ 30,872,000
Number of Joint Ventures \| joint_ventures	37			37
Land Development Joint Ventures [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| home_sites	297	200		498	449
Equity Method Investment, Summarized Financial Information, Revenue	$ 49,000,000.0	$ 62,600,000		$ 138,800,000	$ 102,800,000
Line of Credit Facility, Maximum Borrowing Capacity	100,877,000			100,877,000
Long-term Line of Credit	$ 76,894,000			$ 76,894,000
Home Building Joint Ventures, Total [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| Homes_sold	55	26		72	54
Equity Method Investment, Summarized Financial Information, Revenue	$ 94,600,000	$ 35,400,000		$ 121,800,000	$ 67,900,000
Line of Credit Facility, Maximum Borrowing Capacity	280,118,000			280,118,000
Long-term Line of Credit	$ 247,328,000			$ 247,328,000
Rental Joint Ventures, including the Trust [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Real Estate Properties \| joint_ventures	21			21
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,191,229,000			$ 1,191,229,000
Long-term Line of Credit	$ 924,613,000			$ 924,613,000
Rental Property Joint Ventures College Park, Maryland [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Assets, Fair Value Disclosure							$ 219,000,000.0
Toll Brothers Realty Trust [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Ownership Percentage	33.30%			33.30%
Toll Brothers Realty Trust [Member] \| Management [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Ownership Percentage	33.30%			33.30%
Rental Property Joint Venture Woburn MA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property	289			289
Rental Property Joint Ventures Harrison NY and Frisco TX [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Real Estate Properties \| joint_ventures	2			2
Line of Credit Facility, Maximum Borrowing Capacity	$ 134,400,000			$ 134,400,000
Long-term Line of Credit	5,600,000			5,600,000
Single Family Build to Rent JV [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	900,000			900,000
Rental Property Joint Ventures Harrison NY and Frisco TX [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Payments to Acquire and Develop Real Estate				41,900,000
Land sales earnings, net				8,400,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 13,600,000			$ 13,600,000
Rental Property Joint Ventures Harrison NY and Frisco TX [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Ownership Percentage	75.00%			75.00%
Land Development Joint Ventures [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 139,883,000			$ 139,883,000
Number of Joint Ventures \| joint_ventures	7			7
Land Development Joint Ventures [Member] \| Equity Method Investee [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| home_sites	88	25		195	55
Equity Method Investment, Summarized Financial Information, Revenue	$ 25,300,000	$ 4,200,000		$ 96,500,000	$ 7,300,000
Equity Method Investment, Deferred Gain on Sale		400,000			900,000
Rental Property Joint Ventures College Park, Maryland [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Proceeds from Sale of Equity Method Investments			$ 39,300,000
Equity Method Investment, Realized Gain (Loss) on Disposal			$ 30,800,000
Toll Brothers Realty Trust [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Ownership Percentage	33.30%			33.30%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 0			$ 0
Property Management Fee Revenue				$ 500,000	1,200,000
Gibraltar Joint Ventures [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Ownership Percentage	25.00%			25.00%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 17,547,000			$ 17,547,000
Number of Joint Ventures \| joint_ventures	8			8
Gibraltar Land Banking & Development Joint Ventures [Member] [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Joint Ventures \| joint_ventures	6			6
Occupied or Ready for Occupancy [Member] \| Rental Joint Ventures, including the Trust [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units	2,100			2,100
Lease up Stage [Member] \| Rental Joint Ventures, including the Trust [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units	1,500			1,500
Asset under Construction [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units	1,700			1,700
Asset under Construction [Member] \| Rental Joint Ventures, including the Trust [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units	1,700			1,700
In Planning Phase [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units	13,200			13,200
Line of Credit [Member] \| Rental Property Joint Ventures College Park, Maryland [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity							$ 110,000,000.0
Rental Property Joint Ventures Boston MA, San Diego CA and Miami FL [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Real Estate Properties \| joint_ventures	4			4
Real Estate Investment Property, at Cost	$ 79,400,000			$ 79,400,000
Rental Property Joint Venture Woburn MA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Real Estate Investment Property, at Cost	$ 15,900,000			$ 15,900,000
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	85.00%
Noncontrolling Interest in Variable Interest Entity	15.00%			15.00%
Variable Interest Entity, Primary Beneficiary [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 138,500,000			$ 138,500,000		$ 19,700,000
Noncontrolling Interest in Variable Interest Entity	39,200,000			39,200,000
Variable Interest Entity, Primary Beneficiary [Member] \| Rental Property Joint Ventures Boston MA, San Diego CA and Miami FL [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	118,600,000			118,600,000
Noncontrolling Interest in Variable Interest Entity	36,200,000			36,200,000
Variable Interest Entity, Primary Beneficiary [Member] \| Rental Property Joint Venture Woburn MA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	19,900,000			19,900,000
Noncontrolling Interest in Variable Interest Entity	3,000,000.0			3,000,000.0
Land [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Revenues	4,037,000	$ 0		47,910,000	$ 0
Land [Member] \| Rental Property Joint Ventures Harrison NY and Frisco TX [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Revenues				39,800,000
Commitment To Advance Or Invest In Affiliates Subsidiaries And Joint Venture [Member] \| Single Family Build to Rent JV [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Other Commitment	60,000,000.0			60,000,000.0
Commitment To Advance Or Invest In Affiliates Subsidiaries And Joint Venture [Member] \| Land Development Joint Ventures [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Other Commitment	17,551,000			17,551,000
Commitment To Advance Or Invest In Affiliates Subsidiaries And Joint Venture [Member] \| Gibraltar Joint Ventures [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Other Commitment	9,621,000			9,621,000
Commitment To Advance Or Invest In Affiliates Subsidiaries And Joint Venture [Member] \| Gibraltar Land Banking & Development Joint Ventures [Member] [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Other Commitment	$ 100,000,000.0			$ 100,000,000.0
Minimum [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage				50.00%
Maximum [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage				98.00%