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Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues, Total | $ 4,159.1 | $ 3,776.4 | $ 3,251.3 | $ 2,904.2 | $ 3,741.3 | $ 3,231.9 | $ 2,767.9 | $ 2,416.4 | $ 14,091.0 | $ 12,157.4 | $ 10,824.0
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes | 485.5 | $ 444.5 | $ 353.9 | $ 318.1 | 433.0 | $ 378.6 | $ 300.5 | $ 241.3 | 1,602.1 | 1,353.5 | 1,123.4
Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Homebuilding revenues |  |  |  |  |  |  |  |  | 13,741.5 | 11,861.8 | 10,559.0
Inventory Impairments |  |  |  |  |  |  |  |  |  |  |
Inventory impairments | 12.8 |  |  |  |  |  |  |  | 23.2 | 20.3 | 44.9
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 1,489.3 | 1,264.4 | 1,018.3
Homebuilding inventories |  |  |  |  |  |  |  |  |  |  |
Total inventories | 9,237.1 |  |  |  | 8,340.9 |  |  |  | 9,237.1 | 8,340.9 |
Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Financial Services Revenue |  |  |  |  |  |  |  |  | 349.5 | 295.6 | 265.0
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 112.8 | 89.1 | 105.1
Financial Services Excluding Other [Member] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 124.5 | 98.1 | 105.1
Homebuilding and Financial Services Excluding Other [Member] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 1,613.8 | 1,362.5 | 1,123.4
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | (11.7) | (9.0) | 0.0
East [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Homebuilding revenues |  |  |  |  |  |  |  |  | 1,640.1 | 1,446.5 | 1,333.6
Inventory Impairments |  |  |  |  |  |  |  |  |  |  |
Inventory impairments |  |  |  |  |  |  |  |  | 10.5 | 12.3 | 14.3
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 153.9 | 138.7 | 94.2
Homebuilding inventories |  |  |  |  |  |  |  |  |  |  |
Total inventories | 1,068.9 |  |  |  | 891.1 |  |  |  | 1,068.9 | 891.1 |
Midwest [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Homebuilding revenues |  |  |  |  |  |  |  |  | 736.5 | 651.7 | 666.1
Inventory Impairments |  |  |  |  |  |  |  |  |  |  |
Inventory impairments |  |  |  |  |  |  |  |  | 1.0 | 0.0 | 0.0
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 49.1 | 44.3 | 49.8
Homebuilding inventories |  |  |  |  |  |  |  |  |  |  |
Total inventories | 492.6 |  |  |  | 441.2 |  |  |  | 492.6 | 441.2 |
Southeast [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Homebuilding revenues |  |  |  |  |  |  |  |  | 4,087.6 | 3,463.5 | 2,890.6
Inventory Impairments |  |  |  |  |  |  |  |  |  |  |
Inventory impairments |  |  |  |  |  |  |  |  | 2.4 | 0.7 | 8.8
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 450.3 | 388.4 | 278.7
Homebuilding inventories |  |  |  |  |  |  |  |  |  |  |
Total inventories | 2,392.3 |  |  |  | 2,070.3 |  |  |  | 2,392.3 | 2,070.3 |
South Central [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Homebuilding revenues |  |  |  |  |  |  |  |  | 3,383.1 | 2,995.1 | 2,725.2
Inventory Impairments |  |  |  |  |  |  |  |  |  |  |
Inventory impairments |  |  |  |  |  |  |  |  | 1.6 | 1.0 | 1.4
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 439.1 | 374.8 | 296.6
Homebuilding inventories |  |  |  |  |  |  |  |  |  |  |
Total inventories | 2,199.4 |  |  |  | 2,075.6 |  |  |  | 2,199.4 | 2,075.6 |
Southwest [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Homebuilding revenues |  |  |  |  |  |  |  |  | 597.5 | 388.1 | 336.1
Inventory Impairments |  |  |  |  |  |  |  |  |  |  |
Inventory impairments |  |  |  |  |  |  |  |  | 1.4 | 6.0 | 0.0
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 39.6 | 7.3 | 13.1
Homebuilding inventories |  |  |  |  |  |  |  |  |  |  |
Total inventories | 506.1 |  |  |  | 371.1 |  |  |  | 506.1 | 371.1 |
West [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Homebuilding revenues |  |  |  |  |  |  |  |  | 3,296.7 | 2,916.9 | 2,607.4
Inventory Impairments |  |  |  |  |  |  |  |  |  |  |
Inventory impairments |  |  |  |  |  |  |  |  | 6.3 | 0.3 | 20.4
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 357.3 | 310.9 | $ 285.9
Homebuilding inventories |  |  |  |  |  |  |  |  |  |  |
Total inventories | 2,352.5 |  |  |  | 2,247.6 |  |  |  | 2,352.5 | 2,247.6 |
Corporate and unallocated [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Homebuilding inventories |  |  |  |  |  |  |  |  |  |  |
Total inventories | $ 225.3 |  |  |  | $ 244.0 |  |  |  | $ 225.3 | $ 244.0 |

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