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Segment Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) state region | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) state region segment | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of states with active operations | state | 13 |  |  |  |  |  |  |  | 13 |  |
Number of regions in which entity operates | region | 3 |  |  |  |  |  |  |  | 3 |  |
Number of homebuilding segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 767,945 | $ 511,521 | $ 455,178 | $ 372,489 | $ 672,981 | $ 478,588 | $ 425,468 | $ 339,241 | $ 2,107,133 | $ 1,916,278 | $ 1,822,114
Operating income | 43,462 | $ 17,580 | $ 13,825 | $ 6,681 | 37,783 | $ 15,569 | $ 7,511 | $ 1,275 | 81,548 | 62,138 | 59,325
Depreciation and amortization |  |  |  |  |  |  |  |  | 13,807 | 14,009 | 13,794
Write-off of a deposit on a legacy land investment |  |  |  |  |  |  |  |  | 0 | 2,700 | 0
Excess insurance recovery |  |  |  |  |  |  |  |  |  |  | 3,600
Reduction in home construction expenses |  |  |  |  |  |  |  |  | 200 | 4,800 |
Capital Expenditures |  |  |  |  |  |  |  |  | 17,020 | 12,440 | 12,219
Total Capital Expenditure, cash and noncash |  |  |  |  |  |  |  |  | 17,020 | 12,440 | 12,219
Assets | 2,128,102 |  |  |  | 2,220,995 |  |  |  | 2,128,102 | 2,220,995 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 245,632 | 222,696 | 191,290
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,734 | 12,698 | 11,710
Corporate and unallocated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (164,084) | (160,558) | (131,965)
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,073 | 1,311 | 2,084
Capital Expenditures |  |  |  |  |  |  |  |  | 3,522 | 341 | 461
Assets | 542,713 |  |  |  | 810,881 |  |  |  | 542,713 | 810,881 |
West |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,014,803 | 853,230 | 827,907
West | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 142,310 | 110,600 | 99,835
Depreciation and amortization |  |  |  |  |  |  |  |  | 7,062 | 7,207 | 6,086
Capital Expenditures |  |  |  |  |  |  |  |  | 8,152 | 7,086 | 6,570
Assets | 835,230 |  |  |  | 779,964 |  |  |  | 835,230 | 779,964 |
East |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 524,563 | 551,422 | 526,949
East | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 57,372 | 58,191 | 42,205
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,619 | 2,927 | 3,173
Capital Expenditures |  |  |  |  |  |  |  |  | 2,234 | 2,474 | 2,441
Assets | 335,474 |  |  |  | 298,532 |  |  |  | 335,474 | 298,532 |
Southeast |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 567,767 | 511,626 | 467,258
Southeast | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 45,950 | 53,905 | 49,250
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,053 | 2,564 | 2,451
Capital Expenditures |  |  |  |  |  |  |  |  | 3,112 | 2,539 | $ 2,747
Assets | $ 414,685 |  |  |  | $ 331,618 |  |  |  | $ 414,685 | $ 331,618 |

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