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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Assets
Cash and cash equivalents	$ 1,473.1				$ 1,007.8				$ 1,473.1	$ 1,007.8	$ 1,303.2	$ 1,383.8
Restricted cash	32.9				16.5				32.9	16.5
Inventories:
Construction in progress and finished homes	5,086.3				4,606.0				5,086.3	4,606.0
Residential land and lots — developed and under development	5,172.4				4,519.7				5,172.4	4,519.7
Land held for development	96.1				101.0				96.1	101.0
Land held for sale	40.2				10.4				40.2	10.4
Total inventories	10,395.0				9,237.1				10,395.0	9,237.1
Investment in unconsolidated entities	11.0				0.0				11.0	0.0
Mortgage loans held for sale	796.4				587.3				796.4	587.3
Deferred income taxes, net	194.0				365.0				194.0	365.0
Property and equipment, net	401.1				325.0				401.1	325.0
Other Assets	701.9				565.9				701.9	565.9
Goodwill	109.2				80.0				109.2	80.0
Total assets	14,114.6				12,184.6				14,114.6	12,184.6
Liabilities
Accounts payable	624.7				580.4				624.7	580.4
Accrued expenses and other liabilities	1,127.5				985.0				1,127.5	985.0
Notes payable	3,203.5				2,871.6				3,203.5	2,871.6
Total liabilities	4,955.7				4,437.0				4,955.7	4,437.0
Revenues:
Home sales									15,502.0	13,653.2	11,783.1
Land/lot sales and other									190.7	88.3	78.7
Financial services									375.3	349.5	295.6
Total revenues	4,505.2	$ 4,435.3	$ 3,794.7	$ 3,332.7	4,159.1	$ 3,776.4	$ 3,251.3	$ 2,904.2	16,068.0	14,091.0	12,157.4
Cost of sales:
Home sales									12,194.3	10,927.8	9,403.0
Land/lot sales and other									153.4	74.8	68.2
Inventory and land option charges									50.4	40.2	31.4
Total cost of sales									12,398.1	11,042.8	9,502.6
Selling, general and administrative expense									1,676.8	1,471.6	1,320.3
Equity in earnings of unconsolidated entities									(2.8)	0.0	0.0
Goodwill impairment									0.0	0.0	7.2
Gain on sale of assets									(18.8)	0.0	(4.5)
Interest expense									0.0
Other (income) expense									(45.3)	(25.5)	(21.7)
Income before income taxes	607.7	$ 616.2	$ 444.8	$ 391.2	485.5	$ 444.5	$ 353.9	$ 318.1	2,060.0	1,602.1	1,353.5
Depreciation and amortization									62.4	54.7	61.0
Cash provided by (used in) operating activities									545.2	440.2	623.9
Segment Reconciling Items [Member]
Assets
Cash and cash equivalents	0.0								0.0
Restricted cash	0.0								0.0
Inventories:
Construction in progress and finished homes	0.0								0.0
Residential land and lots — developed and under development	27.2								27.2
Land held for development	0.0								0.0
Land held for sale	0.0								0.0
Total inventories	27.2								27.2
Investment in unconsolidated entities	(0.7)								(0.7)
Mortgage loans held for sale	0.0								0.0
Deferred income taxes, net	(10.5)								(10.5)
Property and equipment, net	0.0								0.0
Other Assets	12.6								12.6
Goodwill	29.2								29.2
Total assets	57.8								57.8
Liabilities
Accounts payable	0.0								0.0
Accrued expenses and other liabilities	(15.2)								(15.2)
Notes payable	8.2								8.2
Total liabilities	(7.0)								(7.0)
Revenues:
Home sales									0.0
Land/lot sales and other									(1.2)
Financial services									0.0
Total revenues									(1.2)
Cost of sales:
Home sales									0.0
Land/lot sales and other									16.4
Inventory and land option charges									0.6
Total cost of sales									17.0
Selling, general and administrative expense									0.5
Equity in earnings of unconsolidated entities									7.1
Gain on sale of assets									24.7
Interest expense									0.0
Other (income) expense									1.0
Income before income taxes									(51.5)
Depreciation and amortization									0.5
Cash provided by (used in) operating activities									(9.9)
Intersegment Eliminations [Member]
Assets
Cash and cash equivalents	0.0								0.0
Restricted cash	0.0								0.0
Inventories:
Construction in progress and finished homes	1.9								1.9
Residential land and lots — developed and under development	(7.2)								(7.2)
Land held for development	0.0								0.0
Land held for sale	0.0								0.0
Total inventories	(5.3)								(5.3)
Investment in unconsolidated entities	0.0								0.0
Mortgage loans held for sale	0.0								0.0
Deferred income taxes, net	1.1								1.1
Property and equipment, net	0.0								0.0
Other Assets	(48.6)								(48.6)
Goodwill	0.0								0.0
Total assets	(52.8)								(52.8)
Liabilities
Accounts payable	(3.3)								(3.3)
Accrued expenses and other liabilities	(46.1)								(46.1)
Notes payable	0.0								0.0
Total liabilities	(49.4)								(49.4)
Revenues:
Home sales									0.0
Land/lot sales and other									(39.1)
Financial services									0.0
Total revenues									(39.1)
Cost of sales:
Home sales									(1.2)
Land/lot sales and other									(30.1)
Inventory and land option charges									0.0
Total cost of sales									(31.3)
Selling, general and administrative expense									0.0
Equity in earnings of unconsolidated entities									2.5
Gain on sale of assets									0.0
Interest expense									(5.8)
Other (income) expense									0.0
Income before income taxes									(4.5)
Depreciation and amortization									0.0
Cash provided by (used in) operating activities									(10.5)
Homebuilding [Member]
Assets
Cash and cash equivalents	1,111.8				973.0				1,111.8	973.0
Restricted cash	8.6				9.3				8.6	9.3
Inventories:
Construction in progress and finished homes	5,084.4				4,606.0				5,084.4	4,606.0
Residential land and lots — developed and under development	4,689.3				4,519.7				4,689.3	4,519.7
Land held for development	61.2				101.0				61.2	101.0
Land held for sale	40.2				10.4				40.2	10.4
Total inventories	9,875.1				9,237.1				9,875.1	9,237.1
Investment in unconsolidated entities	0.0								0.0
Mortgage loans held for sale	0.0				0.0				0.0	0.0
Deferred income taxes, net	176.5				365.0				176.5	365.0
Property and equipment, net	207.1				194.4				207.1	194.4
Other Assets	673.7				518.7				673.7	518.7
Goodwill	80.0				80.0				80.0	80.0
Total assets	12,132.8				11,377.5				12,132.8	11,377.5
Liabilities
Accounts payable	612.4				575.6				612.4	575.6
Accrued expenses and other liabilities	1,041.3				933.1				1,041.3	933.1
Notes payable	2,445.9				2,451.6				2,445.9	2,451.6
Total liabilities	4,099.6				3,960.3				4,099.6	3,960.3
Revenues:
Home sales									15,502.0	13,653.2	11,783.1
Land/lot sales and other									121.8	88.3	78.7
Financial services									0.0	0.0	0.0
Total revenues									15,623.8	13,741.5	11,861.8
Cost of sales:
Home sales									12,195.5	10,927.8	9,403.0
Land/lot sales and other									99.1	74.8	68.2
Inventory and land option charges									48.8	40.2	31.4
Total cost of sales									12,343.4	11,042.8	9,502.6
Selling, general and administrative expense									1,346.2	1,220.4	1,100.3
Equity in earnings of unconsolidated entities									0.0
Goodwill impairment											7.2
Gain on sale of assets									(15.8)		(4.5)
Interest expense									0.0
Other (income) expense									(7.2)	(11.0)	(8.2)
Income before income taxes									1,957.2	1,489.3	1,264.4
Depreciation and amortization									53.4	49.5	58.2
Cash provided by (used in) operating activities									1,001.7	303.7	580.5
Forestar Group [Member]
Assets
Cash and cash equivalents	318.8								318.8
Restricted cash	16.2								16.2
Inventories:
Construction in progress and finished homes	0.0								0.0
Residential land and lots — developed and under development	463.1								463.1
Land held for development	34.9								34.9
Land held for sale	0.0								0.0
Total inventories	498.0								498.0
Investment in unconsolidated entities	11.7								11.7
Mortgage loans held for sale	0.0								0.0
Deferred income taxes, net	26.9								26.9
Property and equipment, net	1.8								1.8
Other Assets	19.7								19.7
Goodwill	0.0								0.0
Total assets	893.1								893.1
Liabilities
Accounts payable	11.2								11.2
Accrued expenses and other liabilities	95.7								95.7
Notes payable	111.7								111.7
Total liabilities	218.6								218.6
Revenues:
Home sales									0.0
Land/lot sales and other									109.2
Financial services									0.0
Total revenues									109.2
Cost of sales:
Home sales									0.0
Land/lot sales and other									68.0
Inventory and land option charges									1.0
Total cost of sales									69.0
Selling, general and administrative expense									32.8
Equity in earnings of unconsolidated entities									(12.4)
Gain on sale of assets									(27.7)
Interest expense									5.8
Other (income) expense									(7.0)
Income before income taxes									48.7
Depreciation and amortization									0.3
Cash provided by (used in) operating activities									(320.3)
Financial Services [Member]
Assets
Cash and cash equivalents	33.7				24.1				33.7	24.1
Restricted cash	8.1				7.2				8.1	7.2
Inventories:
Construction in progress and finished homes	0.0				0.0				0.0	0.0
Residential land and lots — developed and under development	0.0				0.0				0.0	0.0
Land held for development	0.0				0.0				0.0	0.0
Land held for sale	0.0				0.0				0.0	0.0
Total inventories	0.0				0.0				0.0	0.0
Investment in unconsolidated entities	0.0								0.0
Mortgage loans held for sale	796.4				587.3				796.4	587.3
Deferred income taxes, net	0.0				0.0				0.0	0.0
Property and equipment, net	3.0				3.0				3.0	3.0
Other Assets	43.6				42.2				43.6	42.2
Goodwill	0.0				0.0				0.0	0.0
Total assets	884.8				663.8				884.8	663.8
Liabilities
Accounts payable	0.2				1.5				0.2	1.5
Accrued expenses and other liabilities	41.9				35.6				41.9	35.6
Notes payable	637.7				420.0				637.7	420.0
Total liabilities	679.8				457.1				679.8	457.1
Revenues:
Home sales									0.0	0.0	0.0
Land/lot sales and other									0.0	0.0	0.0
Financial services									375.3	349.5	295.6
Total revenues									375.3	349.5	295.6
Cost of sales:
Home sales									0.0	0.0	0.0
Land/lot sales and other									0.0	0.0	0.0
Inventory and land option charges									0.0	0.0	0.0
Total cost of sales									0.0	0.0	0.0
Selling, general and administrative expense									272.6	239.3	211.2
Equity in earnings of unconsolidated entities									0.0
Goodwill impairment											0.0
Gain on sale of assets									0.0		0.0
Interest expense									0.0
Other (income) expense									(15.1)	(14.3)	(13.7)
Income before income taxes									117.8	124.5	98.1
Depreciation and amortization									1.4	1.5	1.2
Cash provided by (used in) operating activities									(116.6)	139.1	44.7
Other Segments [Member]
Assets
Cash and cash equivalents	8.8				10.7				8.8	10.7
Restricted cash	0.0				0.0				0.0	0.0
Inventories:
Construction in progress and finished homes	0.0				0.0				0.0	0.0
Residential land and lots — developed and under development	0.0				0.0				0.0	0.0
Land held for development	0.0				0.0				0.0	0.0
Land held for sale	0.0				0.0				0.0	0.0
Total inventories	0.0				0.0				0.0	0.0
Investment in unconsolidated entities	0.0								0.0
Mortgage loans held for sale	0.0				0.0				0.0	0.0
Deferred income taxes, net	0.0				0.0				0.0	0.0
Property and equipment, net	189.2				127.6				189.2	127.6
Other Assets	0.9				5.0				0.9	5.0
Goodwill	0.0				0.0				0.0	0.0
Total assets	198.9				143.3				198.9	143.3
Liabilities
Accounts payable	4.2				3.3				4.2	3.3
Accrued expenses and other liabilities	9.9				16.3				9.9	16.3
Notes payable	0.0				0.0				0.0	0.0
Total liabilities	14.1				19.6				14.1	19.6
Revenues:
Home sales									0.0	0.0	0.0
Land/lot sales and other									0.0	0.0	0.0
Financial services									0.0	0.0	0.0
Total revenues									0.0	0.0	0.0
Cost of sales:
Home sales									0.0	0.0	0.0
Land/lot sales and other									0.0	0.0	0.0
Inventory and land option charges									0.0	0.0	0.0
Total cost of sales									0.0	0.0	0.0
Selling, general and administrative expense									24.7	11.9	8.8
Equity in earnings of unconsolidated entities									0.0
Goodwill impairment											0.0
Gain on sale of assets									0.0		0.0
Interest expense									0.0
Other (income) expense									(17.0)	(0.2)	0.2
Income before income taxes									(7.7)	(11.7)	(9.0)
Depreciation and amortization									6.8	3.7	1.6
Cash provided by (used in) operating activities									0.8	(2.6)	(1.3)
East [Member] | Homebuilding [Member]
Inventories:
Total inventories	1,192.0				1,068.9				1,192.0	1,068.9
Goodwill	21.8				21.8				21.8	21.8
Revenues:
Total revenues									1,893.4	1,640.1	1,446.5
Cost of sales:
Inventory and land option charges									2.3	13.6	13.4
Income before income taxes									217.3	153.9	138.7
Midwest [Member] | Homebuilding [Member]
Inventories:
Total inventories	583.1				492.6				583.1	492.6
Goodwill	0.0				0.0				0.0	0.0
Revenues:
Total revenues									858.9	736.5	651.7
Cost of sales:
Inventory and land option charges									5.1	1.8	1.1
Income before income taxes									77.5	49.1	44.3
Southeast [Member] | Homebuilding [Member]
Inventories:
Total inventories	2,668.7				2,392.3				2,668.7	2,392.3
Goodwill	40.1				40.1				40.1	40.1
Revenues:
Total revenues									4,578.6	4,087.6	3,463.5
Cost of sales:
Inventory and land option charges									28.8	8.7	4.5
Income before income taxes									536.0	450.3	388.4
South Central [Member] | Homebuilding [Member]
Inventories:
Total inventories	2,439.4				2,199.4				2,439.4	2,199.4
Goodwill	15.9				15.9				15.9	15.9
Revenues:
Total revenues									3,769.9	3,383.1	2,995.1
Cost of sales:
Inventory and land option charges									4.6	4.1	3.1
Income before income taxes									506.1	439.1	374.8
Southwest [Member] | Homebuilding [Member]
Inventories:
Total inventories	499.7				506.1				499.7	506.1
Goodwill	0.0				0.0				0.0	0.0
Revenues:
Total revenues									768.7	597.5	388.1
Cost of sales:
Inventory and land option charges									0.9	1.6	6.2
Income before income taxes									97.4	39.6	7.3
West [Member] | Homebuilding [Member]
Inventories:
Total inventories	2,268.5				2,352.5				2,268.5	2,352.5
Goodwill	2.2				2.2				2.2	2.2
Revenues:
Total revenues									3,754.3	3,296.7	2,916.9
Cost of sales:
Inventory and land option charges									7.1	10.4	3.1
Income before income taxes									522.9	357.3	$ 310.9
Corporate, Non-Segment [Member] | Homebuilding [Member]
Inventories:
Total inventories	$ 223.7				$ 225.3				$ 223.7	$ 225.3

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