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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Sep. 30, 2018
Assets [Abstract]
Cash and cash equivalents	$ 698.8		$ 698.8			$ 1,473.1
Restricted cash	32.4		32.4			32.9
Inventories:
Construction in progress and finished homes	6,087.6		6,087.6			5,086.3
Residential land and lots — developed and under development	5,672.9		5,672.9			5,172.4
Land held for development	110.8		110.8			96.1
Land held for sale	49.0		49.0			40.2
Total inventories	11,920.3		11,920.3			10,395.0
Mortgage loans held for sale	796.5		796.5			796.4
Deferred income taxes, net	171.9		171.9			194.0
Property and equipment, net	437.9		437.9			401.1
Other Assets	785.7		785.7			712.9
Goodwill	163.5		163.5			109.2
Total assets	15,007.0		15,007.0			14,114.6
Liabilities [Abstract]
Accounts payable	658.5		658.5			624.7
Accrued expenses and other liabilities	1,192.1		1,192.1			1,127.5
Notes payable	3,622.4		3,622.4			3,203.5
Total liabilities	5,473.0		5,473.0			4,955.7
Revenues
Home sales	3,980.5	$ 3,672.1	7,391.2	$ 6,856.6
Land/lot sales and other	46.6	27.7	69.6	95.0
Financial services	101.6	94.9	186.9	176.0
Total revenues	4,128.7	3,794.7	7,647.7	7,127.6
Cost of sales
Home sales	3,213.5	2,907.5	5,941.7	5,429.0
Land/lot sales and other	29.4	24.0	44.3	79.0
Inventory and land option charges	13.8	30.1	21.8	33.8
Cost of sales	3,256.7	2,961.6	6,007.8	5,541.8
Selling, General and Administrative Expense	444.2	400.9	847.0	785.1
Gain on sale of assets	(29.3)	(1.1)	(31.3)	(14.5)
Interest Expense		0.0		0.0
Other (income) expense	(5.7)	(11.5)	(14.3)	(20.9)
Income (loss) before income taxes	462.8	444.8	838.5	836.1
Depreciation and amortization			34.1	33.1
Net cash (used in) provided by operating activities			(461.7)	(98.8)
Segment Reconciling Items [Member]
Assets [Abstract]
Cash and cash equivalents	0.0		0.0			0.0
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	12.6		12.6			27.2
Land held for development	0.0		0.0			0.0
Land held for sale	0.0		0.0			0.0
Total inventories	12.6		12.6			27.2
Mortgage loans held for sale	0.0		0.0			0.0
Deferred income taxes, net	(7.5)		(7.5)			(10.5)
Property and equipment, net	0.0		0.0			0.0
Other Assets	12.6		12.6			11.9
Goodwill	29.2		29.2			29.2
Total assets	46.9		46.9			57.8
Liabilities [Abstract]
Accounts payable	0.0		0.0			0.0
Accrued expenses and other liabilities	(13.4)		(13.4)			(15.2)
Notes payable	5.3		5.3			8.2
Total liabilities	(8.1)		(8.1)			(7.0)
Revenues
Home sales	0.0	0.0	0.0	0.0
Land/lot sales and other	0.0	0.0	0.0	0.0
Financial services	0.0	0.0	0.0	0.0
Total revenues	0.0	0.0	0.0	0.0
Cost of sales
Home sales	0.0	0.0	0.0	0.0
Land/lot sales and other	8.2	2.5	11.8	6.9
Inventory and land option charges	0.0	0.0	0.0	0.0
Cost of sales	8.2	2.5	11.8	6.9
Selling, General and Administrative Expense	0.1	0.1	0.3	0.3
Gain on sale of assets	0.0	1.6	0.9	1.6
Interest Expense		0.0		0.0
Other (income) expense	0.0	1.1	0.0	6.4
Income (loss) before income taxes	(8.3)	(5.3)	(13.0)	(15.2)
Depreciation and amortization			0.3	0.3
Net cash (used in) provided by operating activities			(4.4)	(8.1)
Intersegment Eliminations [Member]
Assets [Abstract]
Cash and cash equivalents	0.0		0.0			0.0
Restricted cash	0.0		0.0			0.0
Inventories:
Construction in progress and finished homes	1.5		1.5			1.9
Residential land and lots — developed and under development	(22.1)		(22.1)			(7.2)
Land held for development	0.0		0.0			0.0
Land held for sale	0.0		0.0			0.0
Total inventories	(20.6)		(20.6)			(5.3)
Mortgage loans held for sale	0.0		0.0			0.0
Deferred income taxes, net	1.5		1.5			1.1
Property and equipment, net	0.0		0.0			0.0
Other Assets	(75.2)		(75.2)			(48.6)
Goodwill	0.0		0.0			0.0
Total assets	(94.3)		(94.3)			(52.8)
Liabilities [Abstract]
Accounts payable	(1.7)		(1.7)			(3.3)
Accrued expenses and other liabilities	(83.3)		(83.3)			(46.1)
Notes payable	0.0		0.0			0.0
Total liabilities	(85.0)		(85.0)			(49.4)
Revenues
Home sales	0.0	0.0	0.0	0.0
Land/lot sales and other	(39.7)	(8.5)	(68.7)	(8.5)
Financial services	0.0	0.0	0.0	0.0
Total revenues	(39.7)	(8.5)	(68.7)	(8.5)
Cost of sales
Home sales	(0.7)	0.0	(1.7)	0.0
Land/lot sales and other	(31.8)	(6.7)	(56.3)	(6.7)
Inventory and land option charges	0.0	0.0	0.0	0.0
Cost of sales	(32.5)	(6.7)	(58.0)	(6.7)
Selling, General and Administrative Expense	0.0	0.0	0.0	0.0
Gain on sale of assets	0.0	0.0	0.0	0.0
Interest Expense		(2.1)		(4.2)
Other (income) expense	0.0	0.0	0.0	0.0
Income (loss) before income taxes	(7.2)	0.3	(10.7)	2.4
Depreciation and amortization			0.0	0.0
Net cash (used in) provided by operating activities			(2.7)	0.0
Homebuilding [Member]
Assets [Abstract]
Cash and cash equivalents	557.3		557.3			1,111.8
Restricted cash	9.4		9.4			8.6
Inventories:
Construction in progress and finished homes	6,086.1		6,086.1			5,084.4
Residential land and lots — developed and under development	4,879.4		4,879.4			4,689.3
Land held for development	62.3		62.3			61.2
Land held for sale	49.0		49.0			40.2
Total inventories	11,076.8		11,076.8			9,875.1
Mortgage loans held for sale	0.0		0.0			0.0
Deferred income taxes, net	155.0		155.0			176.5
Property and equipment, net	220.2		220.2			207.1
Other Assets	732.8		732.8			673.7
Goodwill	134.3		134.3			80.0
Total assets	12,885.8		12,885.8			12,132.8
Liabilities [Abstract]
Accounts payable	631.7		631.7			612.4
Accrued expenses and other liabilities	1,102.2		1,102.2			1,041.3
Notes payable	2,777.2		2,777.2			2,445.9
Total liabilities	4,511.1		4,511.1			4,099.6
Revenues
Home sales	3,980.5	3,672.1	7,391.2	6,856.6
Land/lot sales and other	14.9	13.6	21.7	50.0
Financial services	0.0	0.0	0.0	0.0
Total revenues	3,995.4	3,685.7	7,412.9	6,906.6
Cost of sales
Home sales	3,214.2	2,907.5	5,943.4	5,429.0
Land/lot sales and other	9.3	12.0	14.5	43.3
Inventory and land option charges	13.8	30.1	21.8	33.8
Cost of sales	3,237.3	2,949.6	5,979.7	5,506.1
Selling, General and Administrative Expense	359.3	322.7	683.9	627.5
Gain on sale of assets	0.0	0.0	(2.0)	(13.4)
Interest Expense		0.0		0.0
Other (income) expense	(1.6)	(2.6)	(3.5)	(3.4)
Income (loss) before income taxes	400.4	416.0	754.8	789.8
Depreciation and amortization			30.1	26.3
Net cash (used in) provided by operating activities			(215.9)	90.7
Forestar Group [Member]
Assets [Abstract]
Cash and cash equivalents	66.4		66.4			318.8
Restricted cash	15.7		15.7			16.2
Inventories:
Construction in progress and finished homes	0.0		0.0			0.0
Residential land and lots — developed and under development	803.0		803.0			463.1
Land held for development	48.5		48.5			34.9
Land held for sale	0.0		0.0			0.0
Total inventories	851.5		851.5			498.0
Mortgage loans held for sale	0.0		0.0			0.0
Deferred income taxes, net	22.9		22.9			26.9
Property and equipment, net	2.4		2.4			1.8
Other Assets	26.0		26.0			31.4
Goodwill	0.0		0.0			0.0
Total assets	984.9		984.9			893.1
Liabilities [Abstract]
Accounts payable	16.1		16.1			11.2
Accrued expenses and other liabilities	131.9		131.9			95.7
Notes payable	149.2		149.2			111.7
Total liabilities	297.2		297.2			218.6
Revenues
Home sales	0.0	0.0	0.0	0.0
Land/lot sales and other	65.4	22.6	103.8	53.5
Financial services	0.0	0.0	0.0	0.0
Total revenues	65.4	22.6	103.8	53.5
Cost of sales
Home sales	0.0	0.0	0.0	0.0
Land/lot sales and other	43.7	16.2	74.3	35.5
Inventory and land option charges	0.0	0.0	0.0	0.0
Cost of sales	43.7	16.2	74.3	35.5
Selling, General and Administrative Expense	6.2	5.6	11.9	19.1
Gain on sale of assets	0.0	(2.7)	(0.9)	(2.7)
Interest Expense		2.1		4.2
Other (income) expense	(0.9)	(3.2)	(2.8)	(11.3)
Income (loss) before income taxes	16.4	4.6	21.3	8.7
Depreciation and amortization			0.1	2.5
Net cash (used in) provided by operating activities			(283.4)	(150.2)
Financial Services [Member]
Assets [Abstract]
Cash and cash equivalents	61.1		61.1			33.7
Restricted cash	7.3		7.3			8.1
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
Total inventories	0.0		0.0			0.0
Mortgage loans held for sale	796.5		796.5			796.4
Deferred income taxes, net	0.0		0.0			0.0
Property and equipment, net	3.4		3.4			3.0
Other Assets	52.1		52.1			43.6
Goodwill	0.0		0.0			0.0
Total assets	920.4		920.4			884.8
Liabilities [Abstract]
Accounts payable	9.4		9.4			0.2
Accrued expenses and other liabilities	43.8		43.8			41.9
Notes payable	690.7		690.7			637.7
Total liabilities	743.9		743.9			679.8
Revenues
Home sales	0.0	0.0	0.0	0.0
Land/lot sales and other	0.0	0.0	0.0	0.0
Financial services	101.6	94.9	186.9	176.0
Total revenues	101.6	94.9	186.9	176.0
Cost of sales
Home sales	0.0	0.0	0.0	0.0
Land/lot sales and other	0.0	0.0	0.0	0.0
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	71.3	66.7	137.0	128.4
Gain on sale of assets	0.0	0.0	0.0	0.0
Interest Expense		0.0		0.0
Other (income) expense	(3.7)	(3.2)	(7.7)	(6.1)
Income (loss) before income taxes	34.0	31.4	57.6	53.7
Depreciation and amortization			0.7	0.7
Net cash (used in) provided by operating activities			48.8	(30.7)
Other Segments [Member]
Assets [Abstract]
Cash and cash equivalents	14.0		14.0			8.8
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	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
Total inventories	0.0		0.0			0.0
Mortgage loans held for sale	0.0		0.0			0.0
Deferred income taxes, net	0.0		0.0			0.0
Property and equipment, net	211.9		211.9			189.2
Other Assets	37.4		37.4			0.9
Goodwill	0.0		0.0			0.0
Total assets	263.3		263.3			198.9
Liabilities [Abstract]
Accounts payable	3.0		3.0			4.2
Accrued expenses and other liabilities	10.9		10.9			9.9
Notes payable	0.0		0.0			0.0
Total liabilities	13.9		13.9			14.1
Revenues
Home sales	0.0	0.0	0.0	0.0
Land/lot sales and other	6.0	0.0	12.8	0.0
Financial services	0.0	0.0	0.0	0.0
Total revenues	6.0	0.0	12.8	0.0
Cost of sales
Home sales	0.0	0.0	0.0	0.0
Land/lot sales and other	0.0	0.0	0.0	0.0
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	7.3	5.8	13.9	9.8
Gain on sale of assets	(29.3)	0.0	(29.3)	0.0
Interest Expense		0.0		0.0
Other (income) expense	0.5	(3.6)	(0.3)	(6.5)
Income (loss) before income taxes	27.5	(2.2)	28.5	(3.3)
Depreciation and amortization			2.9	3.3
Net cash (used in) provided by operating activities			(4.1)	(0.5)
East [Member] | Homebuilding [Member]
Inventories:
Total inventories	1,354.4		1,354.4			1,192.0
Goodwill					$ 4.6
Revenues
Total revenues	518.2	435.8	965.7	828.9
Cost of sales
Inventory and land option charges	0.3	0.7	1.7	0.6
Income (loss) before income taxes	45.9	46.7	83.9	91.7
Midwest [Member] | Homebuilding [Member]
Inventories:
Total inventories	817.7		817.7			583.1
Goodwill					$ 49.7
Revenues
Total revenues	248.1	203.6	497.2	365.0
Cost of sales
Inventory and land option charges	0.2	0.2	0.5	0.4
Income (loss) before income taxes	9.5	18.7	20.2	32.0
Southeast [Member] | Homebuilding [Member]
Inventories:
Total inventories	2,852.1		2,852.1			2,668.7
Revenues
Total revenues	1,205.3	1,042.0	2,219.2	2,030.6
Cost of sales
Inventory and land option charges	2.2	25.1	3.5	26.2
Income (loss) before income taxes	131.0	96.3	243.2	218.8
South Central [Member] | Homebuilding [Member]
Inventories:
Total inventories	2,720.6		2,720.6			2,439.4
Revenues
Total revenues	990.2	919.0	1,862.7	1,727.8
Cost of sales
Inventory and land option charges	1.4	0.6	1.9	1.9
Income (loss) before income taxes	119.3	120.5	225.3	222.0
Southwest [Member] | Homebuilding [Member]
Inventories:
Total inventories	628.1		628.1			499.7
Revenues
Total revenues	173.2	172.1	316.9	328.5
Cost of sales
Inventory and land option charges	0.1	0.0	0.2	0.8
Income (loss) before income taxes	18.6	22.0	36.3	36.7
West [Member] | Homebuilding [Member]
Inventories:
Total inventories	2,466.9		2,466.9			2,268.5
Revenues
Total revenues	860.4	913.2	1,551.2	1,625.8
Cost of sales
Inventory and land option charges	9.6	3.5	14.0	3.9
Income (loss) before income taxes	76.1	$ 111.8	145.9	$ 188.6
Corporate, Non-Segment [Member] | Homebuilding [Member]
Inventories:
Total inventories	$ 237.0		$ 237.0			$ 223.7

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