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Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) state region | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) segment state region | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |
Number of states in which home building segments operate | 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 | $ 455,178 | $ 425,468 | $ 827,667 | $ 764,709 |  |
Operating income | 13,825 | 7,511 | 20,506 | 8,786 |  |
Depreciation and amortization | 3,066 | 3,155 | 5,573 | 5,832 |  |
Write-off of deposit on legacy land investment |  |  | 0 | 2,700 |  |
Capital Expenditures |  |  | 8,192 | 5,677 |  |
Assets | 2,107,503 |  | 2,107,503 |  | $ 2,220,995 | $ 2,220,995
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income | 48,538 | 43,885 | 83,954 | 71,472 |  |
Depreciation and amortization | 2,790 | 2,799 | 5,064 | 5,042 |  |
Corporate and unallocated |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income | (34,713) | (36,374) | (63,448) | (62,686) |  |
Depreciation and amortization | 276 | 356 | 509 | 790 |  |
Capital Expenditures |  |  | 1,636 | 191 |  |
Assets | 591,972 |  | 591,972 |  | 810,881 |
West Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue | 234,510 | 185,155 | 412,481 | 356,904 |  |
West Segment | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income | 31,715 | 20,779 | 52,825 | 41,794 |  |
Depreciation and amortization | 1,697 | 1,545 | 2,953 | 2,793 |  |
Capital Expenditures |  |  | 4,238 | 3,165 |  |
Assets | 830,572 |  | 830,572 |  | 779,964 |
East Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue | 107,412 | 116,640 | 196,265 | 200,799 |  |
East Segment | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income | 8,926 | 10,532 | 16,322 | 12,089 |  |
Depreciation and amortization | 551 | 598 | 990 | 1,127 |  |
Capital Expenditures |  |  | 1,133 | 1,446 |  |
Assets | 318,984 |  | 318,984 |  | 298,532 |
Southeast Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue | 113,256 | 123,673 | 218,921 | 207,006 |  |
Southeast Segment | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income | 7,897 | 12,574 | 14,807 | 17,589 |  |
Depreciation and amortization | 542 | $ 656 | 1,121 | 1,122 |  |
Capital Expenditures |  |  | 1,185 | $ 875 |  |
Assets | $ 365,975 |  | $ 365,975 |  | $ 331,618 |

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