v3.26.1
Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Assets [Abstract]          
Cash and cash equivalents $ 2,078.7   $ 2,078.7   $ 2,985.4
Restricted cash 56.2   56.2   47.9
Inventories:          
Construction in progress and finished homes 9,083.9   9,083.9   7,648.5
Residential land and lots — developed and under development 14,318.9   14,318.9   14,695.8
Land held for development 206.6   206.6   218.3
Land held for sale 31.7   31.7   21.4
Rental properties 3,045.8   3,045.8   2,703.3
Total inventories 26,686.9   26,686.9   25,287.3
Mortgage loans held for sale 2,990.6   2,990.6   2,566.5
Deferred tax asset, net 0.0   0.0   44.5
Property and equipment, net 607.5   607.5   578.9
Other assets 3,927.9   3,927.9   3,797.2
Goodwill 163.5   163.5   163.5
Total assets 36,511.3   36,511.3   35,471.2
Liabilities [Abstract]          
Accounts payable 1,388.4   1,388.4   1,221.9
Deferred tax liability, net 43.4   43.4   0.0
Accrued expenses and other liabilities 3,560.4   3,560.4   3,541.6
Notes payable 7,112.6   7,112.6   5,965.5
Total liabilities 12,104.8   12,104.8   10,729.0
Revenues          
Total revenues 9,227.1 $ 9,225.7 23,672.2 $ 24,572.6  
Inventory and land option charges 21.9 54.2 65.2 100.8  
Cost of sales 7,080.9 7,016.5 18,227.9 18,553.1  
Selling, General and Administrative Expense (991.2) (944.3) (2,759.7) (2,721.1)  
Other (income) expense (71.2) (93.2) (207.0) (236.7)  
Income (loss) before income taxes 1,226.2 1,358.1 2,891.6 3,535.1  
Depreciation and amortization     84.8 73.9  
Net cash provided by operating activities     880.8 949.1  
HomeBuildingOps          
Revenues          
Home sales 8,681.9 8,561.0 22,240.1 22,887.9  
Cost of Product and Service Sold 6,809.6 6,629.4 17,504.2 17,663.1  
Land [Member]          
Revenues          
Home sales 58.4 56.2 246.5 226.7  
Cost of Product and Service Sold 34.6 37.9 168.5 132.0  
Rental          
Revenues          
Home sales 266.1 380.7 587.4 835.0  
Cost of Product and Service Sold 214.8 295.0 490.0 657.2  
Financial Services [Member]          
Revenues          
Home sales 220.7 227.8 598.2 623.0  
HomeBuildingOps          
Assets [Abstract]          
Cash and cash equivalents 1,268.8   1,268.8   2,210.5
Restricted cash 25.5   25.5   25.5
Inventories:          
Construction in progress and finished homes 9,218.1   9,218.1   7,743.7
Residential land and lots — developed and under development 12,012.4   12,012.4   12,513.1
Land held for development 52.6   52.6   38.3
Land held for sale 31.7   31.7   21.4
Rental properties 0.0   0.0   0.0
Total inventories 21,314.8   21,314.8   20,316.5
Mortgage loans held for sale 0.0   0.0   0.0
Deferred tax asset, net 45.4   45.4   125.7
Property and equipment, net 572.8   572.8   543.0
Other assets 3,528.5   3,528.5   3,344.1
Goodwill 134.3   134.3   134.3
Total assets 26,890.1   26,890.1   26,699.6
Liabilities [Abstract]          
Accounts payable 1,212.8   1,212.8   1,016.8
Deferred tax liability, net 0.0   0.0    
Accrued expenses and other liabilities 3,145.4   3,145.4   3,122.1
Notes payable 3,685.3   3,685.3   3,154.4
Total liabilities 8,043.5   8,043.5   7,293.3
Revenues          
Total revenues 8,686.2 8,580.8 22,278.3 22,951.0  
Inventory and land option charges 21.0 51.9 56.7 93.2  
Cost of sales 6,908.6 6,760.5 17,781.6 17,955.3  
Selling, General and Administrative Expense (720.6) (670.0) (2,002.0) (1,944.5)  
Other (income) expense (9.6) (36.0) (37.9) (83.0)  
Income (loss) before income taxes 1,066.6 1,186.3 2,532.6 3,134.2  
Depreciation and amortization     79.1 68.1  
Net cash provided by operating activities     1,349.5 1,738.6  
HomeBuildingOps | HomeBuildingOps          
Revenues          
Home sales 8,681.9 8,561.0 22,240.1 22,887.9  
Cost of Product and Service Sold 6,884.6 6,691.6 17,695.3 17,828.4  
HomeBuildingOps | Land [Member]          
Revenues          
Home sales 4.3 19.8 38.2 63.1  
Cost of Product and Service Sold 3.0 17.0 29.6 33.7  
HomeBuildingOps | Rental          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Cost of Product and Service Sold 0.0 0.0 0.0 0.0  
HomeBuildingOps | Financial Services [Member]          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Rental          
Assets [Abstract]          
Cash and cash equivalents 118.4   118.4   140.8
Restricted cash 4.3   4.3   2.5
Inventories:          
Construction in progress and finished homes 0.0   0.0   0.0
Residential land and lots — developed and under development 0.0   0.0   0.0
Land held for development 0.0   0.0   0.0
Land held for sale 0.0   0.0   0.0
Rental properties 3,054.9   3,054.9   2,710.4
Total inventories 3,054.9   3,054.9   2,710.4
Mortgage loans held for sale 0.0   0.0   0.0
Deferred tax asset, net (42.2)   (42.2)   (42.2)
Property and equipment, net 0.6   0.6   0.6
Other assets 55.8   55.8   38.9
Goodwill 0.0   0.0   0.0
Total assets 3,191.8   3,191.8   2,851.0
Liabilities [Abstract]          
Accounts payable 217.0   217.0   230.6
Deferred tax liability, net 0.0   0.0    
Accrued expenses and other liabilities 47.7   47.7   34.7
Notes payable 820.3   820.3   600.0
Total liabilities 1,085.0   1,085.0   865.3
Revenues          
Total revenues 266.1 380.7 587.4 835.0  
Inventory and land option charges 0.1 0.4 0.4 4.3  
Cost of sales 218.1 296.0 494.2 662.1  
Selling, General and Administrative Expense (55.5) (61.4) (154.4) (165.8)  
Other (income) expense (38.5) (31.5) (104.7) (82.3)  
Income (loss) before income taxes 31.0 54.8 43.5 89.4  
Depreciation and amortization     1.3 1.5  
Net cash provided by operating activities     (324.6) (294.5)  
Rental | HomeBuildingOps          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Cost of Product and Service Sold 0.0 0.0 0.0 0.0  
Rental | Land [Member]          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Cost of Product and Service Sold 0.0 0.0 0.0 0.0  
Rental | Rental          
Revenues          
Home sales 266.1 380.7 587.4 835.0  
Cost of Product and Service Sold 218.0 295.6 493.8 657.8  
Rental | Financial Services [Member]          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Forestar Group [Member]          
Assets [Abstract]          
Cash and cash equivalents 394.9   394.9   379.2
Restricted cash 0.0   0.0   0.0
Inventories:          
Construction in progress and finished homes 0.0   0.0   0.0
Residential land and lots — developed and under development 2,557.5   2,557.5   2,465.1
Land held for development 154.0   154.0   180.0
Land held for sale 0.0   0.0   0.0
Rental properties 0.0   0.0   0.0
Total inventories 2,711.5   2,711.5   2,645.1
Mortgage loans held for sale 0.0   0.0   0.0
Deferred tax asset, net 0.0   0.0   0.0
Property and equipment, net 7.3   7.3   8.1
Other assets 106.9   106.9   104.6
Goodwill 0.0   0.0   0.0
Total assets 3,220.6   3,220.6   3,137.0
Liabilities [Abstract]          
Accounts payable 65.3   65.3   71.0
Deferred tax liability, net 92.8   92.8    
Accrued expenses and other liabilities 410.9   410.9   494.3
Notes payable 793.8   793.8   802.8
Total liabilities 1,362.8   1,362.8   1,368.1
Revenues          
Total revenues 407.0 390.5 1,054.3 991.9  
Inventory and land option charges 0.8 1.9 7.9 3.9  
Cost of sales 322.9 310.8 835.0 778.0  
Selling, General and Administrative Expense (38.3) (37.4) (112.7) (111.8)  
Other (income) expense (2.9) (1.3) (6.8) (4.1)  
Income (loss) before income taxes 48.7 43.6 113.4 106.2  
Depreciation and amortization     2.4 2.6  
Net cash provided by operating activities     27.6 (453.9)  
Forestar Group [Member] | HomeBuildingOps          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Cost of Product and Service Sold 0.0 0.0 0.0 0.0  
Forestar Group [Member] | Land [Member]          
Revenues          
Home sales 407.0 390.5 1,054.3 991.9  
Cost of Product and Service Sold 322.1 308.9 827.1 774.1  
Forestar Group [Member] | Rental          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Cost of Product and Service Sold 0.0 0.0 0.0 0.0  
Forestar Group [Member] | Financial Services [Member]          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Financial Services [Member]          
Assets [Abstract]          
Cash and cash equivalents 255.5   255.5   244.5
Restricted cash 26.4   26.4   19.9
Inventories:          
Construction in progress and finished homes 0.0   0.0   0.0
Residential land and lots — developed and under development 0.0   0.0   0.0
Land held for development 0.0   0.0   0.0
Land held for sale 0.0   0.0   0.0
Rental properties 0.0   0.0   0.0
Total inventories 0.0   0.0   0.0
Mortgage loans held for sale 2,990.6   2,990.6   2,566.5
Deferred tax asset, net 0.0   0.0   0.0
Property and equipment, net 3.9   3.9   4.3
Other assets 213.5   213.5   220.6
Goodwill 0.0   0.0   0.0
Total assets 3,489.9   3,489.9   3,055.8
Liabilities [Abstract]          
Accounts payable 0.3   0.3   0.7
Deferred tax liability, net 0.0   0.0    
Accrued expenses and other liabilities 339.3   339.3   294.7
Notes payable 1,813.2   1,813.2   1,408.3
Total liabilities 2,152.8   2,152.8   1,703.7
Revenues          
Total revenues 220.7 227.8 598.2 623.0  
Inventory and land option charges 0.0 0.0 0.0 0.0  
Cost of sales 0.0 0.0 0.0 0.0  
Selling, General and Administrative Expense (172.1) (171.0) (477.0) (485.4)  
Other (income) expense (21.7) (24.5) (58.8) (65.4)  
Income (loss) before income taxes 70.3 81.3 180.0 203.0  
Depreciation and amortization     1.5 1.4  
Net cash provided by operating activities     (221.7) (20.1)  
Financial Services [Member] | HomeBuildingOps          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Cost of Product and Service Sold 0.0 0.0 0.0 0.0  
Financial Services [Member] | Land [Member]          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Cost of Product and Service Sold 0.0 0.0 0.0 0.0  
Financial Services [Member] | Rental          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Cost of Product and Service Sold 0.0 0.0 0.0 0.0  
Financial Services [Member] | Financial Services [Member]          
Revenues          
Home sales 220.7 227.8 598.2 623.0  
Eliminations and Other          
Assets [Abstract]          
Cash and cash equivalents 41.1   41.1   10.4
Restricted cash 0.0   0.0   0.0
Inventories:          
Construction in progress and finished homes (134.2)   (134.2)   (95.2)
Residential land and lots — developed and under development (251.0)   (251.0)   (282.4)
Land held for development 0.0   0.0   0.0
Land held for sale 0.0   0.0   0.0
Rental properties (9.1)   (9.1)   (7.1)
Total inventories (394.3)   (394.3)   (384.7)
Mortgage loans held for sale 0.0   0.0   0.0
Deferred tax asset, net (3.2)   (3.2)   (39.0)
Property and equipment, net 22.9   22.9   22.9
Other assets 23.2   23.2   89.0
Goodwill 29.2   29.2   29.2
Total assets (281.1)   (281.1)   (272.2)
Liabilities [Abstract]          
Accounts payable (107.0)   (107.0)   (97.2)
Deferred tax liability, net (49.4)   (49.4)    
Accrued expenses and other liabilities (382.9)   (382.9)   (404.2)
Notes payable 0.0   0.0   0.0
Total liabilities (539.3)   (539.3)   (501.4)
Revenues          
Total revenues (352.9) (354.1) (846.0) (828.3)  
Inventory and land option charges 0.0 0.0 0.2 (0.6)  
Cost of sales (368.7) (350.8) (882.9) (842.3)  
Selling, General and Administrative Expense (4.7) (4.5) (13.6) (13.6)  
Other (income) expense 1.5 0.1 1.2 (1.9)  
Income (loss) before income taxes 9.6 (7.9) 22.1 2.3  
Depreciation and amortization     0.5 0.3  
Net cash provided by operating activities     50.0 (21.0)  
Eliminations and Other | HomeBuildingOps          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Cost of Product and Service Sold (75.0) (62.2) (191.1) (165.3)  
Eliminations and Other | Land [Member]          
Revenues          
Home sales (352.9) (354.1) (846.0) (828.3)  
Cost of Product and Service Sold (290.5) (288.0) (688.2) (675.8)  
Eliminations and Other | Rental          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Cost of Product and Service Sold (3.2) (0.6) (3.8) (0.6)  
Eliminations and Other | Financial Services [Member]          
Revenues          
Home sales 0.0 0.0 0.0 0.0  
Northwest | HomeBuildingOps          
Inventories:          
Total inventories 1,906.6   1,906.6   1,891.8
Revenues          
Total revenues 652.3 698.9 1,738.7 1,892.5  
Inventory and land option charges 0.2 0.3 0.8 3.4  
Cost of sales 525.8 532.7 1,394.5 1,450.9  
Selling, General and Administrative Expense (60.2) (53.1) (166.2) (162.8)  
Other (income) expense (2.0) (3.3) (4.3) (7.5)  
Income (loss) before income taxes 68.3 116.4 182.3 286.3  
Northwest | HomeBuildingOps | HomeBuildingOps          
Revenues          
Home sales 652.0 698.8 1,737.9 1,892.3  
Cost of Product and Service Sold 525.3 532.4 1,393.3 1,447.5  
Northwest | HomeBuildingOps | Land [Member]          
Revenues          
Home sales 0.3 0.1 0.8 0.2  
Cost of Product and Service Sold 0.3 0.0 0.4 0.0  
Southwest [Member] | HomeBuildingOps          
Inventories:          
Total inventories 3,084.8   3,084.8   3,068.5
Revenues          
Total revenues 1,171.6 1,182.4 3,101.5 3,386.2  
Inventory and land option charges 1.1 6.5 5.2 12.8  
Cost of sales 943.9 945.9 2,503.7 2,681.7  
Selling, General and Administrative Expense (92.8) (89.5) (264.6) (272.7)  
Other (income) expense (1.1) (5.7) (5.6) (12.6)  
Income (loss) before income taxes 136.0 152.7 338.8 444.4  
Southwest [Member] | HomeBuildingOps | HomeBuildingOps          
Revenues          
Home sales 1,171.6 1,166.2 3,086.6 3,369.7  
Cost of Product and Service Sold 943.0 924.3 2,486.4 2,654.0  
Southwest [Member] | HomeBuildingOps | Land [Member]          
Revenues          
Home sales 0.0 16.2 14.9 16.5  
Cost of Product and Service Sold (0.2) 15.1 12.1 14.9  
South Central [Member] | HomeBuildingOps          
Inventories:          
Total inventories 4,070.3   4,070.3   3,931.9
Revenues          
Total revenues 1,967.5 1,940.8 4,868.7 4,958.4  
Inventory and land option charges 7.2 7.6 23.0 13.2  
Cost of sales 1,544.6 1,512.7 3,840.3 3,850.9  
Selling, General and Administrative Expense (155.1) (144.8) (425.7) (405.1)  
Other (income) expense (1.7) (6.9) (6.6) (17.5)  
Income (loss) before income taxes 269.5 290.2 609.3 719.9  
South Central [Member] | HomeBuildingOps | HomeBuildingOps          
Revenues          
Home sales 1,967.1 1,938.2 4,867.9 4,954.7  
Cost of Product and Service Sold 1,537.4 1,503.4 3,817.3 3,835.6  
South Central [Member] | HomeBuildingOps | Land [Member]          
Revenues          
Home sales 0.4 2.6 0.8 3.7  
Cost of Product and Service Sold 0.0 1.7 0.0 2.1  
Southeast [Member] | HomeBuildingOps          
Inventories:          
Total inventories 4,226.4   4,226.4   4,061.8
Revenues          
Total revenues 1,919.4 1,923.5 4,935.9 5,287.1  
Inventory and land option charges 3.5 22.6 9.8 35.5  
Cost of sales 1,532.1 1,553.2 3,965.3 4,203.1  
Selling, General and Administrative Expense (158.1) (153.1) (439.5) (442.8)  
Other (income) expense (1.6) (7.4) (8.4) (17.5)  
Income (loss) before income taxes 230.8 224.6 539.5 658.7  
Southeast [Member] | HomeBuildingOps | HomeBuildingOps          
Revenues          
Home sales 1,916.5 1,923.2 4,921.1 5,255.5  
Cost of Product and Service Sold 1,525.7 1,530.5 3,942.9 4,158.4  
Southeast [Member] | HomeBuildingOps | Land [Member]          
Revenues          
Home sales 2.9 0.3 14.8 31.6  
Cost of Product and Service Sold 2.9 0.1 12.6 9.2  
East [Member] | HomeBuildingOps          
Inventories:          
Total inventories 4,825.9   4,825.9   4,397.7
Revenues          
Total revenues 1,754.9 1,668.5 4,387.3 4,343.1  
Inventory and land option charges 6.8 11.6 13.5 22.4  
Cost of sales 1,397.4 1,313.0 3,513.0 3,377.8  
Selling, General and Administrative Expense (152.5) (132.9) (416.4) (385.1)  
Other (income) expense (1.7) (7.8) (7.0) (16.4)  
Income (loss) before income taxes 206.7 230.4 464.9 596.6  
East [Member] | HomeBuildingOps | HomeBuildingOps          
Revenues          
Home sales 1,754.5 1,668.3 4,386.7 4,336.5  
Cost of Product and Service Sold 1,390.6 1,301.4 3,499.5 3,350.7  
East [Member] | HomeBuildingOps | Land [Member]          
Revenues          
Home sales 0.4 0.2 0.6 6.6  
Cost of Product and Service Sold 0.0 0.0 0.0 4.7  
North | HomeBuildingOps          
Inventories:          
Total inventories 2,822.4   2,822.4   2,637.6
Revenues          
Total revenues 1,220.5 1,166.7 3,246.2 3,083.7  
Inventory and land option charges 2.2 3.3 4.4 5.9  
Cost of sales 964.8 903.0 2,564.8 2,390.9  
Selling, General and Administrative Expense (101.9) (96.6) (289.6) (276.0)  
Other (income) expense (1.5) (4.9) (6.0) (11.5)  
Income (loss) before income taxes 155.3 172.0 397.8 428.3  
North | HomeBuildingOps | HomeBuildingOps          
Revenues          
Home sales 1,220.2 1,166.3 3,239.9 3,079.2  
Cost of Product and Service Sold 962.6 899.6 2,555.9 2,382.2  
North | HomeBuildingOps | Land [Member]          
Revenues          
Home sales 0.3 0.4 6.3 4.5  
Cost of Product and Service Sold 0.0 $ 0.1 4.5 $ 2.8  
Corporate, Non-Segment [Member] | HomeBuildingOps          
Inventories:          
Total inventories $ 378.4   $ 378.4   $ 327.2