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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Investments in Unconsolidated Entities (Details Textual)	3 Months Ended				9 Months Ended
	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($) joint_ventures Homes_sold rental_units home_sites	Jul. 31, 2018 USD ($) Homes_sold home_sites	Jan. 31, 2018 USD ($)	Jul. 31, 2019 USD ($) joint_ventures Homes_sold rental_units home_sites	Jul. 31, 2018 USD ($) Homes_sold home_sites	Oct. 31, 2018 USD ($)	May 10, 2018 USD ($)	Nov. 01, 2017 USD ($)
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Summarized Financial Information, Revenue		$ 179,608,000	$ 117,239,000		$ 511,226,000	$ 393,522,000
Revenues		1,765,691,000	1,913,353,000		4,844,966,000	4,688,020,000
Land sales earnings, net			$ 888,000			$ 4,175,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures		354,569,000			354,569,000		$ 431,813,000
Line of Credit Facility, Maximum Borrowing Capacity		1,467,783,000			1,467,783,000
Long-term Line of Credit		1,224,794,000			1,224,794,000
Other Commitment		$ 32,966,000			$ 32,966,000
Number of Joint Ventures \| joint_ventures		37			37
rental property joint venture westborough [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Assets, Fair Value Disclosure								$ 65,500,000
Land Development Joint Ventures [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| home_sites		182	226		680	675
Equity Method Investment, Summarized Financial Information, Revenue		$ 43,500,000	$ 73,700,000		$ 182,400,000	$ 176,400,000
Line of Credit Facility, Maximum Borrowing Capacity		100,859,000			100,859,000
Long-term Line of Credit		$ 91,635,000			$ 91,635,000
Home Building Joint Ventures, Total [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| Homes_sold		33	19		105	73
Equity Method Investment, Summarized Financial Information, Revenue		$ 95,800,000	$ 36,000,000.0		$ 217,600,000	$ 104,000,000.0
Line of Credit Facility, Maximum Borrowing Capacity		218,237,000			218,237,000
Long-term Line of Credit		$ 196,891,000			$ 196,891,000
Rental Joint Ventures, including the Trust [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Real Estate Properties \| joint_ventures		22			22
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,148,687,000			$ 1,148,687,000
Long-term Line of Credit		$ 936,268,000			$ 936,268,000
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		12,100,000			12,100,000
Rental Property Joint Venture Phoenixville, PA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Assets, Fair Value Disclosure		77,800,000			77,800,000
rental property joint venture westborough [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Proceeds from Sale of Equity Method Investments			$ 12,100,000
Equity Method Investment, Realized Gain (Loss) on Disposal						$ 8,700,000
Rental Property Joint Venture Phoenixville, PA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Proceeds from Sale of Equity Method Investments		7,400,000
Equity Method Investment, Realized Gain (Loss) on Disposal		3,800,000
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		$ 14,400,000			$ 14,400,000
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		$ 116,464,000			$ 116,464,000
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		53	70		248	125
Equity Method Investment, Summarized Financial Information, Revenue		$ 20,400,000	$ 42,700,000		$ 116,900,000	$ 50,000,000.0
Equity Method Investment, Deferred Gain on Sale			500,000			1,400,000
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					$ 800,000	1,700,000
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		$ 21,541,000			$ 21,541,000
Number of Joint Ventures \| joint_ventures		9			9
Gibraltar Land Banking & Development Joint Ventures [Member] [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Joint Ventures \| joint_ventures		7			7
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		1,700			1,700
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		1,900			1,900
Asset under Construction [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units		1,200			1,200
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		3,200			3,200
In Planning Phase [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units		13,400			13,400
Line of Credit [Member] \| rental property joint venture westborough [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity								$ 30,100,000
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
Line of Credit [Member] \| Rental Property Joint Venture Phoenixville, PA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity		$ 47,000,000.0			$ 47,000,000.0
Subsequent Event [Member] \| Rental Property Joint Venture Atlanta, GA [Member]
Schedule of Equity Method Investments [Line Items]
Maximum repapyment and carry cost guarantee obligation for borrowings by JV	$ 63,700,000
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	63,700,000
Subsequent Event [Member] \| Rental Property Joint Venture Atlanta, GA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Payments to Acquire and Develop Real Estate	$ 43,400,000
Subsequent Event [Member] \| Rental Property Joint Venture Atlanta, GA [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Ownership Percentage	75.00%
Rental Property Joint Venture Phoenixville, PA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage		25.00%
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		$ 139,900,000			$ 139,900,000		$ 19,700,000
Noncontrolling Interest in Variable Interest Entity		39,400,000			39,400,000
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		119,900,000			119,900,000
Noncontrolling Interest in Variable Interest Entity		36,400,000			36,400,000
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		20,000,000.0			20,000,000.0
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		8,721,000	$ 0		56,631,000	$ 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
Land [Member] \| Subsequent Event [Member] \| Rental Property Joint Venture Atlanta, GA [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Revenues	$ 33,800,000
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		21,160,000			21,160,000
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%