| In millions, except per share items | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Sales and marketing expenses | 24.2 | 19.1 | 18.0 | 12.3 | 12.7 | 9.9 | 16.6 | 13.9 |
| General and administrative expenses | 27.0 | 22.6 | 24.4 | 16.9 | 13.9 | 15.0 | 11.3 | 11.4 |
| Total operating expenses | 51.2 | 41.7 | 42.4 | 29.2 | 26.6 | 24.9 | 27.8 | 25.3 |
| Income from operations | 26.9 | 23.4 | 43.5 | 6.2 | 16.0 | -6.1 | 14.8 | 4.5 |
| Other (expense) income, net | -2.0 | 0.3 | 0.0 | 0.4 | 3.6 | -0.1 | -0.3 | 0.3 |
| Equity in net income (loss) of unconsolidated joint ventures | 0.1 | 0.0 | 0.4 | 0.2 | 0.7 | 0.0 | -0.2 | -0.6 |
| (Loss) gain on remeasurement of warrant liability | -1.8 | -5.6 | 5.3 | 7.0 | -5.3 | -5.0 | | |
| Pretax income (loss) | 23.2 | 18.1 | 49.2 | 13.8 | 14.9 | -11.2 | 14.3 | 4.2 |
| Provision (benefit) for income taxes | 8.4 | 5.1 | 10.8 | 3.0 | 4.2 | -4.1 | 3.7 | 1.0 |
| Net income (loss) | 14.9 | 13.1 | 38.4 | 10.8 | 10.7 | -7.1 | 10.7 | 3.2 |
| Net income (loss) attributable to noncontrolling interests | -0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Net income (loss) attributable to Landsea Homes Corporation | 14.9 | 13.1 | 38.4 | 10.8 | 10.7 | -7.1 | 10.7 | 3.2 |
| |
| Earnings (loss) per share: | | | | | | | | |
| Basic (in dollars per share) | $0.34 | $0.28 | $0.83 | $0.23 | $0.23 | ($0.16) | $0.33 | $0.10 |
| Diluted (in dollars per share) | $0.34 | $0.28 | $0.83 | $0.23 | $0.23 | ($0.16) | $0.33 | $0.10 |
| |
| Weighted average shares outstanding: | | | | | | | | |
| Basic (in shares) | 43.1 | 45.3 | 45.2 | 45.3 | 45.3 | 44.2 | 32.6 | 32.6 |
| Diluted (in shares) | 43.2 | 45.5 | 45.3 | 45.3 | 45.3 | 44.2 | 32.6 | 32.6 |
| Revenue | 368.7 | 316.2 | 398.5 | 214.1 | 250.3 | 160.4 | 284.7 | 218.5 |
| Revenue growth | 47.3% | 97.1% | 39.9% | -2.0% | 163.3% | 17.7% | 41698.1% | 24380.8% |
| Cost of sales and expenses | | | | | | | | |
| Gross margin | 78.1 | 65.2 | 85.9 | 35.4 | 42.6 | 18.8 | 42.6 | 29.8 |
| Gross margin | 21.2% | 20.6% | 21.6% | 16.5% | 17.0% | 11.7% | 15.0% | 13.6% |
| |
| Inventory impairments | | | | | | | | |
| Total cost of sales | 290.6 | 251.1 | 312.6 | 178.8 | 207.7 | 141.6 | 242.1 | 188.7 |