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Basis of Presentation (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) Lot Home | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Oct. 01, 2018 USD ($) | Sep. 30, 2018 USD ($)
Entity Information [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 75.00% |  |  |
Payments to Acquire Businesses |  | $ 309.6 | $ 158.1 |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ 27.1 |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 25.00% |  |  |
Goodwill |  | $ 163.5 |  |  | $ 109.2
Contract Asset Insurance Renewals |  | 34.4 |  |  | 0.0
Accounting Standards Update 2016-18 [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Increase (Decrease) in Restricted Cash |  |  | $ (38.9) |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Contract Asset Insurance Renewals |  |  |  | $ 32.4 |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Payments to Acquire Businesses | 325.9 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 265.5 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 23.3 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | (25.8) |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest | 325.9 |  |  |  |
Goodwill | 54.3 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 8.6 |  |  |  |
Business Acquisition, Number of Homes Acquired | Home | 700 |  |  |  |
Business Acquisition, Number of Finished Lots Acquired | Lot | 4,500 |  |  |  |
Business Acquisition, Number of Lots Under Option Contracts | Lot | 4,300 |  |  |  |
Business Acquisition, Sales Order Backlog Acquired (Homes) | Home | 700 |  |  |  |
Homebuilding [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Goodwill |  | $ 134.3 |  |  | $ 80.0
Homebuilding [Member] | Midwest [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Goodwill | $ 49.7 |  |  |  |
Homebuilding [Member] | East [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Goodwill | 4.6 |  |  |  |
Minimum [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 1 year |  |  |
Maximum [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 3 years |  |  |
Retained Earnings [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | 27.1 |  |  |  |
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ 27.1 |  |  |  |

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