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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% |  |  |  |

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