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Supplemental Guarantor Information - Statement of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Financial Services [Abstract] |  |  |  |
Income before income taxes | $ 444.5 | $ 378.6 | $ 1,116.5 | $ 920.4
Income tax expense | 155.5 | 128.8 | 391.4 | 317.8
Net income | 289.0 | 249.8 | 725.1 | 602.6
Comprehensive income | 289.0 | 249.8 | 725.1 | 601.2
Eliminations [Member] |  |  |  |
Financial Services [Abstract] |  |  |  |
Income before income taxes | (317.0) | (306.0) | (851.8) | (751.1)
Income tax expense | (111.1) | (105.0) | (299.2) | (259.7)
Net income | (205.9) | (201.0) | (552.6) | (491.4)
Comprehensive income | (205.9) | (201.0) | (552.6) | (491.4)
D.R. Horton, Inc. [Member] |  |  |  |
Financial Services [Abstract] |  |  |  |
Income before income taxes | 444.5 | 381.3 | 1,116.5 | 925.6
Income tax expense | 155.5 | 130.6 | 391.4 | 319.6
Net income | 289.0 | 250.7 | 725.1 | 606.0
Comprehensive income | 289.0 | 250.7 | 725.1 | 604.6
Guarantor Subsidiaries [Member] |  |  |  |
Financial Services [Abstract] |  |  |  |
Income before income taxes | 291.7 | 274.5 | 768.4 | 681.8
Income tax expense | 101.3 | 92.4 | 267.7 | 234.0
Net income | 190.4 | 182.1 | 500.7 | 447.8
Comprehensive income | 190.4 | 182.1 | 500.7 | 447.8
Non-Guarantor Subsidiaries [Member] |  |  |  |
Financial Services [Abstract] |  |  |  |
Income before income taxes | 25.3 | 28.8 | 83.4 | 64.1
Income tax expense | 9.8 | 10.8 | 31.5 | 23.9
Net income | 15.5 | 18.0 | 51.9 | 40.2
Comprehensive income | 15.5 | 18.0 | 51.9 | 40.2
Homebuilding [Member] |  |  |  |
Homebuilding: |  |  |  |
Revenues | 3,684.5 | 3,148.8 | 9,675.0 | 8,210.8
Cost of sales | 2,961.1 | 2,523.0 | 7,778.9 | 6,584.3
Total gross profit | 723.4 | 625.8 | 1,896.1 | 1,626.5
Selling, general and administrative expense | 309.5 | 279.3 | 872.4 | 778.4
Equity in (income) of subsidiaries | 0.0 | 0.0 | 0.0 | 0.0
Other (income) expense | (1.3) | (1.9) | (7.8) | (11.2)
Financial Services [Abstract] |  |  |  |
Income before income taxes | 415.2 | 348.4 | 1,031.5 | 859.3
Homebuilding [Member] | Eliminations [Member] |  |  |  |
Homebuilding: |  |  |  |
Revenues | 0.0 | (10.6) | 0.0 | (16.0)
Cost of sales | 0.0 | (7.9) | 0.0 | (10.8)
Total gross profit | 0.0 | (2.7) | 0.0 | (5.2)
Selling, general and administrative expense | 0.0 | 0.0 | 0.0 | 0.0
Equity in (income) of subsidiaries | 317.0 | 303.3 | 851.8 | 745.9
Other (income) expense | 0.0 | 0.0 | 0.0 | 0.0
Financial Services [Abstract] |  |  |  |
Income before income taxes | (317.0) | (306.0) | (851.8) | (751.1)
Homebuilding [Member] | D.R. Horton, Inc. [Member] |  |  |  |
Homebuilding: |  |  |  |
Revenues | 1,332.0 | 1,040.8 | 3,344.5 | 2,700.7
Cost of sales | 1,056.7 | 836.9 | 2,670.0 | 2,170.5
Total gross profit | 275.3 | 203.9 | 674.5 | 530.2
Selling, general and administrative expense | 148.5 | 126.6 | 415.7 | 357.4
Equity in (income) of subsidiaries | (317.0) | (303.3) | (851.8) | (745.9)
Other (income) expense | (0.7) | (0.7) | (5.9) | (6.9)
Financial Services [Abstract] |  |  |  |
Income before income taxes | 444.5 | 381.3 | 1,116.5 | 925.6
Homebuilding [Member] | Guarantor Subsidiaries [Member] |  |  |  |
Homebuilding: |  |  |  |
Revenues | 2,352.3 | 2,118.6 | 6,293.0 | 5,526.1
Cost of sales | 1,900.9 | 1,693.2 | 5,072.9 | 4,429.3
Total gross profit | 451.4 | 425.4 | 1,220.1 | 1,096.8
Selling, general and administrative expense | 159.9 | 151.5 | 452.8 | 418.4
Equity in (income) of subsidiaries | 0.0 | 0.0 | 0.0 | 0.0
Other (income) expense | (0.2) | (0.6) | (1.1) | (3.4)
Financial Services [Abstract] |  |  |  |
Income before income taxes | 291.7 | 274.5 | 768.4 | 681.8
Homebuilding [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |
Homebuilding: |  |  |  |
Revenues | 0.2 | 0.0 | 37.5 | 0.0
Cost of sales | 3.5 | 0.8 | 36.0 | (4.7)
Total gross profit | (3.3) | (0.8) | 1.5 | 4.7
Selling, general and administrative expense | 1.1 | 1.2 | 3.9 | 2.6
Equity in (income) of subsidiaries | 0.0 | 0.0 | 0.0 | 0.0
Other (income) expense | (0.4) | (0.6) | (0.8) | (0.9)
Financial Services [Abstract] |  |  |  |
Income before income taxes | (4.0) | (1.4) | (1.6) | 3.0
Financial Services and Other [Member] |  |  |  |
Financial Services [Abstract] |  |  |  |
Revenues | 91.9 | 83.1 | 256.9 | 205.4
General and administrative expense | 65.0 | 57.5 | 183.1 | 157.1
Interest and other (income) expense | (2.4) | (4.6) | (11.2) | (12.8)
Income before income taxes | 29.3 | 30.2 | 85.0 | 61.1
Financial Services and Other [Member] | Eliminations [Member] |  |  |  |
Financial Services [Abstract] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
General and administrative expense | 0.0 | 0.0 | 0.0 | 0.0
Interest and other (income) expense | 0.0 | 0.0 | 0.0 | 0.0
Income before income taxes | 0.0 | 0.0 | 0.0 | 0.0
Financial Services and Other [Member] | D.R. Horton, Inc. [Member] |  |  |  |
Financial Services [Abstract] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
General and administrative expense | 0.0 | 0.0 | 0.0 | 0.0
Interest and other (income) expense | 0.0 | 0.0 | 0.0 | 0.0
Income before income taxes | 0.0 | 0.0 | 0.0 | 0.0
Financial Services and Other [Member] | Guarantor Subsidiaries [Member] |  |  |  |
Financial Services [Abstract] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
General and administrative expense | 0.0 | 0.0 | 0.0 | 0.0
Interest and other (income) expense | 0.0 | 0.0 | 0.0 | 0.0
Income before income taxes | 0.0 | 0.0 | 0.0 | 0.0
Financial Services and Other [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |
Financial Services [Abstract] |  |  |  |
Revenues | 91.9 | 83.1 | 256.9 | 205.4
General and administrative expense | 65.0 | 57.5 | 183.1 | 157.1
Interest and other (income) expense | (2.4) | (4.6) | (11.2) | (12.8)
Income before income taxes | $ 29.3 | $ 30.2 | $ 85.0 | $ 61.1

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