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Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Homebuilding revenues:          
Total revenues $ 2,767.9 $ 2,398.0 $ 5,184.3 $ 4,700.7  
Income Before Income Taxes          
Income before income taxes [1] 300.5 230.1 541.8 450.8  
Homebuilding [Member]          
Homebuilding revenues:          
Homebuilding revenues 2,701.0 2,338.5 5,062.1 4,591.5  
Inventory Impairments          
Total inventory impairments 3.2 8.1 3.7 12.0  
Income Before Income Taxes          
Income before income taxes 283.1 208.6 512.1 414.7  
Homebuilding Inventories          
Total homebuilding inventories [2] 8,216.6   8,216.6   $ 7,807.0
Financial Services [Member]          
Homebuilding revenues:          
Financial services revenues 66.9 59.5 122.2 109.2  
Income Before Income Taxes          
Income before income taxes 17.4 21.5 29.7 36.1  
Operating Segments [Member] | Homebuilding [Member]          
Homebuilding revenues:          
Homebuilding revenues 2,701.0 2,338.5 5,062.1 4,591.5  
Inventory Impairments          
Total inventory impairments 3.2 8.1 3.7 12.0  
Income Before Income Taxes          
Income before income taxes [1] 283.1 208.6 512.1 414.7  
Operating Segments [Member] | Financial Services [Member]          
Homebuilding revenues:          
Financial services revenues 66.9 59.5 122.2 109.2  
Reportable Geographical Components [Member] | East [Member] | Homebuilding [Member]          
Homebuilding revenues:          
Homebuilding revenues 309.0 280.7 607.2 579.5  
Inventory Impairments          
Total inventory impairments 3.2 0.0 3.2 0.0  
Income Before Income Taxes          
Income before income taxes [1] 22.8 13.0 50.5 39.4  
Homebuilding Inventories          
Total homebuilding inventories [2] 837.6   837.6   817.3
Reportable Geographical Components [Member] | Midwest [Member] | Homebuilding [Member]          
Homebuilding revenues:          
Homebuilding revenues 162.1 145.0 285.4 274.9  
Inventory Impairments          
Total inventory impairments 0.0 0.0 0.0 0.0  
Income Before Income Taxes          
Income before income taxes [1] 9.0 10.2 16.0 15.0  
Homebuilding Inventories          
Total homebuilding inventories [2] 451.5   451.5   474.5
Reportable Geographical Components [Member] | Southeast [Member] | Homebuilding [Member]          
Homebuilding revenues:          
Homebuilding revenues 812.0 646.1 1,523.6 1,265.5  
Inventory Impairments          
Total inventory impairments 0.0 7.3 0.2 7.3  
Income Before Income Taxes          
Income before income taxes [1] 94.8 58.7 171.7 116.7  
Homebuilding Inventories          
Total homebuilding inventories [2] 1,973.1   1,973.1   1,876.7
Reportable Geographical Components [Member] | South Central [Member] | Homebuilding [Member]          
Homebuilding revenues:          
Homebuilding revenues 694.7 628.2 1,307.2 1,207.9  
Inventory Impairments          
Total inventory impairments 0.0 0.7 0.0 0.7  
Income Before Income Taxes          
Income before income taxes [1] 89.0 65.1 153.7 126.2  
Homebuilding Inventories          
Total homebuilding inventories [2] 2,111.3   2,111.3   1,909.0
Reportable Geographical Components [Member] | Southwest [Member] | Homebuilding [Member]          
Homebuilding revenues:          
Homebuilding revenues 79.9 70.9 153.8 146.3  
Inventory Impairments          
Total inventory impairments 0.0 0.0 0.0 0.0  
Income Before Income Taxes          
Income before income taxes [1] 2.0 1.2 4.7 3.1  
Homebuilding Inventories          
Total homebuilding inventories [2] 346.0   346.0   312.4
Reportable Geographical Components [Member] | West [Member] | Homebuilding [Member]          
Homebuilding revenues:          
Homebuilding revenues 643.3 567.6 1,184.9 1,117.4  
Inventory Impairments          
Total inventory impairments 0.0 0.1 0.3 4.0  
Income Before Income Taxes          
Income before income taxes [1] 65.5 $ 60.4 115.5 $ 114.3  
Homebuilding Inventories          
Total homebuilding inventories [2] 2,233.1   2,233.1   2,165.3
Corporate and Unallocated [Member] | Homebuilding [Member]          
Homebuilding Inventories          
Total homebuilding inventories [2],[3] $ 264.0   $ 264.0   $ 251.8
[1] Expenses maintained at the corporate level consist primarily of interest and property taxes, which are capitalized and amortized to cost of sales or expensed directly, and the expenses related to operating the Company’s corporate office. The amortization of capitalized interest and property taxes is allocated to each segment based on the segment’s cost of sales, while those expenses associated with the corporate office are allocated to each segment based on the segment’s inventory balances.
[2] Homebuilding inventories are the only assets included in the measure of homebuilding segment assets used by the Company’s chief operating decision makers.
[3] Corporate and unallocated consists primarily of capitalized interest and property taxes.