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Investments in Unconsolidated Entities (Details Textual)
3 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Jan. 31, 2018
USD ($)
joint_ventures
Homes_sold
rental_units
home_sites
Jan. 31, 2017
USD ($)
Homes_sold
home_sites
Oct. 31, 2017
USD ($)
Nov. 01, 2017
USD ($)
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Land Sales   $ 6,968,000 $ 144,714,000    
Equity Method Investment, Summarized Financial Information, Revenue   193,620,000 295,702,000    
Proceeds from Equity Method Investment, Distribution   38,892,000 48,581,000    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures   449,748,000   $ 481,758,000  
Line of Credit Facility, Maximum Borrowing Capacity   1,531,354,000      
Long-term Line of Credit   1,115,356,000      
Management Fees Revenue   $ 3,071,000 $ 4,289,000    
Land Development Joint Ventures [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Home sites sold | home_sites   249 303    
Land Sales   $ 40,200,000 $ 56,300,000    
Line of Credit Facility, Maximum Borrowing Capacity   200,988,000      
Long-term Line of Credit   $ 184,944,000      
Home Building Joint Ventures, Total [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Home sites sold | Homes_sold   28 87    
Equity Method Investment, Summarized Financial Information, Revenue   $ 32,600,000 $ 217,400,000    
Line of Credit Facility, Maximum Borrowing Capacity   382,031,000      
Long-term Line of Credit   $ 196,536,000      
Rental Joint Ventures, including the Trust [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Number of Real Estate Properties | joint_ventures   12      
Line of Credit Facility, Maximum Borrowing Capacity   $ 948,335,000      
Long-term Line of Credit   733,876,000      
Rental Property Joint Ventures College Park, Maryland [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Land Sales   $ 219,000,000      
Rental Property Joint Venture Belmont MA [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Number of Units in Real Estate Property   112      
Future financing to be obtained by JV   $ 42,400,000      
Rental Property Joint Venture Suburban Philadelphia [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Debt Instrument, Term 10 years        
Long-term Debt   $ 56,000,000      
Toll Brothers Realty Trust [Member] | Co-venturer [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Equity Method Investment, Ownership Percentage   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%      
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   $ 225,283,000      
Land Development Joint Ventures [Member] | Equity Method Investee [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Home sites sold | home_sites   30 102    
Equity Method Investment, Summarized Financial Information, Revenue   $ 3,200,000 $ 25,000,000    
Equity Method Investment, Deferred Gain on Sale   500,000 3,700,000    
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      
Rental Property Joint Venture Belmont MA [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Payments to Acquire and Develop Real Estate       $ 22,100,000  
Proceeds from Equity Method Investment, Distribution   10,800,000      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures   11,300,000      
Rental Property Joint Venture Belmont MA [Member] | Co-venturer [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Land Sales   $ 11,000,000      
Equity Method Investment, Ownership Percentage   50.00%      
Rental Property Joint Venture Suburban Philadelphia [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Equity Method Investment, Ownership Percentage   25.00%      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures   $ 2,800,000      
Toll Brothers Realty Trust [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Equity Method Investment, Ownership Percentage   33.30%      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures   $ 0      
Management Fees Revenue   $ 600,000 400,000    
Gibraltar Joint Ventures [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Equity Method Investment, Ownership Percentage   25.00%      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures   $ 14,598,000      
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   2,800      
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   750      
Asset under Construction [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Number of Units in Real Estate Property | rental_units   1,050      
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   1,250      
In Planning Phase [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Number of Units in Real Estate Property | rental_units   9,350      
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Rental Property Joint Venture Suburban Philadelphia [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Proceeds from Sale of Equity Method Investments     12,000,000    
Equity Method Investment, Realized Gain (Loss) on Disposal     6,200,000    
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
Line of Credit [Member] | Rental Property Joint Venture Suburban Philadelphia [Member]          
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]          
Long-term Line of Credit $ 54,100,000   $ 54,100,000