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Supplemental Guarantor Information - Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
OPERATING ACTIVITIES |  |  |
Net cash (used in) provided by operating activities | $ 618.0 | $ 700.4 | $ (661.4)
INVESTING ACTIVITIES |  |  |
Purchases of property and equipment | (86.1) | (56.1) | (100.2)
Proceeds from the sale of property and equipment to a related party | 0.0 | 56.0 | 0.0
Decrease (increase) in restricted cash | 0.2 | (0.7) | 67.8
Net principal decrease (increase) of other mortgage loans and real estate owned | 19.7 | (8.9) | (5.6)
Proceeds from sale (purchases) of debt securities collateralized by residential real estate | 35.8 | (14.8) | 0.0
Intercompany advances | 0.0 | 0.0 | 0.0
Payments related to acquisition of a business | (82.2) | (70.9) | (244.1)
Net cash used in investing activities | (112.6) | (95.4) | (282.1)
FINANCING ACTIVITIES |  |  |
Proceeds from Notes Payable | 0.0 | 1,590.7 | 1,427.6
Repayments of Notes Payable | (549.7) | (1,456.2) | (796.9)
Intercompany advances | 0.0 | 0.0 | 0.0
Proceeds from stock associated with certain employee benefit plans | 72.4 | 61.8 | 45.2
Income tax benefit from stock option exercises | 10.0 | 12.3 | 0.6
Cash dividends paid | (118.7) | (91.6) | (48.6)
Net cash provided by (used in) financing activities | (586.0) | 117.0 | 627.9
Increase (decrease) in cash and cash equivalents | (80.6) | 722.0 | (315.6)
Cash and cash equivalents at beginning of year | 1,383.8 | 661.8 | 977.4
Cash and cash equivalents at end of year | 1,303.2 | 1,383.8 | 661.8
Consolidation, Eliminations [Member] |  |  |
OPERATING ACTIVITIES |  |  |
Net cash (used in) provided by operating activities | (77.8) | (31.6) | (52.6)
INVESTING ACTIVITIES |  |  |
Purchases of property and equipment | 16.0 | 0.0 | 0.0
Proceeds from the sale of property and equipment to a related party |  | 0.0 |
Decrease (increase) in restricted cash | 0.0 | 0.0 | 0.0
Net principal decrease (increase) of other mortgage loans and real estate owned | 0.0 | 0.0 | 0.0
Proceeds from sale (purchases) of debt securities collateralized by residential real estate | 0.0 | 0.0 |
Intercompany advances | (409.9) | (444.7) | 385.7
Payments related to acquisition of a business | 0.0 | 0.0 | 0.0
Net cash used in investing activities | (393.9) | (444.7) | 385.7
FINANCING ACTIVITIES |  |  |
Proceeds from Notes Payable |  | 0.0 | 0.0
Repayments of Notes Payable | 0.0 | 0.0 | 0.0
Intercompany advances | 409.9 | 444.7 | (385.7)
Proceeds from stock associated with certain employee benefit plans | 0.0 | 0.0 | 0.0
Income tax benefit from stock option exercises | 0.0 | 0.0 | 0.0
Cash dividends paid | 61.8 | 31.6 | 52.6
Net cash provided by (used in) financing activities | 471.7 | 476.3 | (333.1)
Increase (decrease) in cash and cash equivalents | 0.0 | 0.0 | 0.0
Cash and cash equivalents at beginning of year | 0.0 | 0.0 | 0.0
Cash and cash equivalents at end of year | 0.0 | 0.0 | 0.0
D.R Horton, Inc. [Member] |  |  |
OPERATING ACTIVITIES |  |  |
Net cash (used in) provided by operating activities | 115.1 | 308.2 | (257.4)
INVESTING ACTIVITIES |  |  |
Purchases of property and equipment | (40.7) | (24.5) | (63.9)
Proceeds from the sale of property and equipment to a related party |  | 56.0 |
Decrease (increase) in restricted cash | 0.0 | (0.4) | 69.7
Net principal decrease (increase) of other mortgage loans and real estate owned | 0.0 | 0.0 | 0.0
Proceeds from sale (purchases) of debt securities collateralized by residential real estate | 35.8 | (14.8) |
Intercompany advances | 409.9 | 444.7 | (385.7)
Payments related to acquisition of a business | (82.2) | (70.9) | (244.1)
Net cash used in investing activities | 322.8 | 390.1 | (624.0)
FINANCING ACTIVITIES |  |  |
Proceeds from Notes Payable |  | 1,472.0 | 1,307.0
Repayments of Notes Payable | (542.9) | (1,432.5) | (796.8)
Intercompany advances | 0.0 | 0.0 | 0.0
Proceeds from stock associated with certain employee benefit plans | 72.4 | 61.8 | 45.2
Income tax benefit from stock option exercises | 10.0 | 12.3 | 0.6
Cash dividends paid | (118.7) | (91.6) | (48.6)
Net cash provided by (used in) financing activities | (579.2) | 22.0 | 507.4
Increase (decrease) in cash and cash equivalents | (141.3) | 720.3 | (374.0)
Cash and cash equivalents at beginning of year | 1,217.7 | 497.4 | 871.4
Cash and cash equivalents at end of year | 1,076.4 | 1,217.7 | 497.4
Guarantor Subsidiaries [Member] |  |  |
OPERATING ACTIVITIES |  |  |
Net cash (used in) provided by operating activities | 596.7 | 530.1 | (293.9)
INVESTING ACTIVITIES |  |  |
Purchases of property and equipment | (14.3) | (24.8) | (28.0)
Proceeds from the sale of property and equipment to a related party |  | 0.0 |
Decrease (increase) in restricted cash | 0.2 | (0.3) | (0.9)
Net principal decrease (increase) of other mortgage loans and real estate owned | 0.0 | 0.0 | 0.0
Proceeds from sale (purchases) of debt securities collateralized by residential real estate | 0.0 | 0.0 |
Intercompany advances | 0.0 | 0.0 | 0.0
Payments related to acquisition of a business | 0.0 | 0.0 | 0.0
Net cash used in investing activities | (14.1) | (25.1) | (28.9)
FINANCING ACTIVITIES |  |  |
Proceeds from Notes Payable |  | 0.0 | 0.0
Repayments of Notes Payable | (1.9) | (6.3) | 0.0
Intercompany advances | (521.3) | (493.6) | 373.9
Proceeds from stock associated with certain employee benefit plans | 0.0 | 0.0 | 0.0
Income tax benefit from stock option exercises | 0.0 | 0.0 | 0.0
Cash dividends paid | 0.0 | 0.0 | 0.0
Net cash provided by (used in) financing activities | (523.2) | (499.9) | 373.9
Increase (decrease) in cash and cash equivalents | 59.4 | 5.1 | 51.1
Cash and cash equivalents at beginning of year | 94.6 | 89.5 | 38.4
Cash and cash equivalents at end of year | 154.0 | 94.6 | 89.5
Non-Guarantor Subsidiaries [Member] |  |  |
OPERATING ACTIVITIES |  |  |
Net cash (used in) provided by operating activities | (16.0) | (106.3) | (57.5)
INVESTING ACTIVITIES |  |  |
Purchases of property and equipment | (47.1) | (6.8) | (8.3)
Proceeds from the sale of property and equipment to a related party |  | 0.0 |
Decrease (increase) in restricted cash | 0.0 | 0.0 | (1.0)
Net principal decrease (increase) of other mortgage loans and real estate owned | 19.7 | (8.9) | (5.6)
Proceeds from sale (purchases) of debt securities collateralized by residential real estate | 0.0 | 0.0 |
Intercompany advances | 0.0 | 0.0 | 0.0
Payments related to acquisition of a business | 0.0 | 0.0 | 0.0
Net cash used in investing activities | (27.4) | (15.7) | (14.9)
FINANCING ACTIVITIES |  |  |
Proceeds from Notes Payable |  | 118.7 | 120.6
Repayments of Notes Payable | (4.9) | (17.4) | (0.1)
Intercompany advances | 111.4 | 48.9 | 11.8
Proceeds from stock associated with certain employee benefit plans | 0.0 | 0.0 | 0.0
Income tax benefit from stock option exercises | 0.0 | 0.0 | 0.0
Cash dividends paid | (61.8) | (31.6) | (52.6)
Net cash provided by (used in) financing activities | 44.7 | 118.6 | 79.7
Increase (decrease) in cash and cash equivalents | 1.3 | (3.4) | 7.3
Cash and cash equivalents at beginning of year | 71.5 | 74.9 | 67.6
Cash and cash equivalents at end of year | $ 72.8 | $ 71.5 | $ 74.9

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