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Supplemental Guarantor Information - Consolidating Statements of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |  |  | $ 7.2 | $ 9.8 | $ 0.0
Income before income taxes | $ 433.0 | $ 378.6 | $ 300.5 | $ 241.3 | $ 338.8 | $ 333.8 | $ 230.1 | $ 220.7 | 1,353.5 | 1,123.4 | 814.2
Income tax expense (benefit) | 149.4 | 128.8 | 105.4 | 83.6 | 99.9 | 112.4 | 82.2 | 78.2 | 467.2 | 372.7 | 280.7
Net income | 283.6 | 249.8 | 195.1 | 157.7 | 238.9 | 221.4 | 147.9 | 142.5 | 886.3 | 750.7 | 533.5
Comprehensive income |  |  |  |  |  |  |  |  | 884.9 | 749.9 | 533.8
Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 11,861.8 | 10,559.0 | 7,858.5
Cost of sales |  |  |  |  |  |  |  |  | 9,502.6 | 8,535.7 | 6,268.6
Gross profit | 732.6 | $ 625.8 | $ 531.7 | $ 468.9 | 582.3 | $ 556.0 | $ 446.5 | $ 438.6 | 2,359.2 | 2,023.3 | 1,589.9
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 1,100.3 | 1,003.0 | 826.9
Goodwill impairment | $ 7.2 |  |  |  | $ 9.8 |  |  |  | 7.2 | 9.8 | 0.0
Equity in (income) of subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other (income) |  |  |  |  |  |  |  |  | (12.7) | (7.8) | (5.5)
Income before income taxes |  |  |  |  |  |  |  |  | 1,264.4 | 1,018.3 | 768.5
Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 89.1 | 105.1 | 45.7
Financial Services [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues, net of recourse and reinsurance expense |  |  |  |  |  |  |  |  | 295.6 | 265.0 | 166.4
General and administrative expense |  |  |  |  |  |  |  |  | 220.0 | 183.0 | 138.5
Interest and other income |  |  |  |  |  |  |  |  | (13.5) | (23.1) | (17.8)
D.R Horton, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 1,358.7 | 1,123.4 | 814.2
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 469.0 | 372.7 | 280.7
Net income |  |  |  |  |  |  |  |  | 889.7 | 750.7 | 533.5
Comprehensive income |  |  |  |  |  |  |  |  | 888.3 | 750.7 | 533.5
D.R Horton, Inc. [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,947.5 | 3,334.6 | 2,547.4
Cost of sales |  |  |  |  |  |  |  |  | 3,163.6 | 2,698.1 | 2,038.0
Gross profit |  |  |  |  |  |  |  |  | 783.9 | 636.5 | 509.4
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 503.8 | 461.2 | 388.3
Goodwill impairment |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Equity in (income) of subsidiaries |  |  |  |  |  |  |  |  | (1,071.0) | (945.9) | (691.8)
Other (income) |  |  |  |  |  |  |  |  | (7.6) | (2.2) | (1.3)
Income before income taxes |  |  |  |  |  |  |  |  | 1,358.7 | 1,123.4 | 814.2
D.R Horton, Inc. [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Financial Services [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues, net of recourse and reinsurance expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
General and administrative expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest and other income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 976.8 | 846.4 | 647.7
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 334.9 | 277.2 | 222.1
Net income |  |  |  |  |  |  |  |  | 641.9 | 569.2 | 425.6
Comprehensive income |  |  |  |  |  |  |  |  | 641.9 | 568.4 | 425.9
Guarantor Subsidiaries [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,930.3 | 7,224.4 | 5,299.9
Cost of sales |  |  |  |  |  |  |  |  | 6,357.5 | 5,834.3 | 4,222.5
Gross profit |  |  |  |  |  |  |  |  | 1,572.8 | 1,390.1 | 1,077.4
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 592.7 | 538.8 | 433.0
Goodwill impairment |  |  |  |  |  |  |  |  | 7.2 | 9.8 |
Equity in (income) of subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other (income) |  |  |  |  |  |  |  |  | (3.9) | (4.9) | (3.3)
Income before income taxes |  |  |  |  |  |  |  |  | 976.8 | 846.4 | 647.7
Guarantor Subsidiaries [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Financial Services [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues, net of recourse and reinsurance expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
General and administrative expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest and other income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 94.2 | 99.5 | 44.1
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 35.5 | 37.4 | 16.6
Net income |  |  |  |  |  |  |  |  | 58.7 | 62.1 | 27.5
Comprehensive income |  |  |  |  |  |  |  |  | 58.7 | 62.1 | 27.5
Non-Guarantor Subsidiaries [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 11.2
Cost of sales |  |  |  |  |  |  |  |  | (7.7) | 3.3 | 8.1
Gross profit |  |  |  |  |  |  |  |  | 7.7 | (3.3) | 3.1
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 3.8 | 3.0 | 5.6
Goodwill impairment |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Equity in (income) of subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other (income) |  |  |  |  |  |  |  |  | (1.2) | (0.7) | (0.9)
Income before income taxes |  |  |  |  |  |  |  |  | 5.1 | (5.6) | (1.6)
Non-Guarantor Subsidiaries [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 89.1 | 105.1 | 45.7
Financial Services [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues, net of recourse and reinsurance expense |  |  |  |  |  |  |  |  | 295.6 | 265.0 | 166.4
General and administrative expense |  |  |  |  |  |  |  |  | 220.0 | 183.0 | 138.5
Interest and other income |  |  |  |  |  |  |  |  | (13.5) | (23.1) | (17.8)
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | (1,076.2) | (945.9) | (691.8)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (372.2) | (314.6) | (238.7)
Net income |  |  |  |  |  |  |  |  | (704.0) | (631.3) | (453.1)
Comprehensive income |  |  |  |  |  |  |  |  | (704.0) | (631.3) | (453.1)
Consolidation, Eliminations [Member] | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (16.0) | 0.0 | 0.0
Cost of sales |  |  |  |  |  |  |  |  | (10.8) | 0.0 | 0.0
Gross profit |  |  |  |  |  |  |  |  | (5.2) | 0.0 | 0.0
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Goodwill impairment |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Equity in (income) of subsidiaries |  |  |  |  |  |  |  |  | 1,071.0 | 945.9 | 691.8
Other (income) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income before income taxes |  |  |  |  |  |  |  |  | (1,076.2) | (945.9) | (691.8)
Consolidation, Eliminations [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Supplemental Consolidating Statement of Operations |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Financial Services [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues, net of recourse and reinsurance expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
General and administrative expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest and other income |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.0

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