| 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 | 73.6 | 62.1 | 52.8 | 51.5 | 53.1 | 48.4 | 48.1 | 31.5 |
| General and administrative expenses | 91.0 | 77.9 | 70.3 | 57.1 | 51.6 | 47.6 | 42.6 | 31.5 |
| Total operating expenses | 164.5 | 139.9 | 123.1 | 108.5 | 104.6 | 96.0 | 90.7 | 63.1 |
| Income from operations | 100.0 | 89.0 | 59.5 | 30.8 | 29.1 | 1.0 | 4.2 | -10.9 |
| Other (expense) income, net | -1.4 | 4.2 | 3.9 | 3.7 | 3.5 | -0.8 | 0.1 | 0.3 |
| Equity in net income (loss) of unconsolidated joint ventures | 0.7 | 1.3 | 1.3 | 0.6 | -0.2 | -14.7 | -16.4 | -16.2 |
| (Loss) gain on remeasurement of warrant liability | 5.1 | 1.5 | 2.1 | -3.2 | -10.3 | -5.0 | | |
| Pretax income (loss) | 104.3 | 96.0 | 66.7 | 31.8 | 22.2 | -19.5 | -12.2 | -26.1 |
| Provision (benefit) for income taxes | 27.3 | 23.1 | 14.0 | 6.8 | 4.8 | -5.9 | -3.1 | -6.6 |
| Net income (loss) | 77.1 | 72.9 | 52.7 | 25.0 | 17.4 | -13.5 | -9.1 | -19.7 |
| Net income (loss) attributable to noncontrolling interests | -0.1 | 0.0 | -0.1 | -0.1 | 0.0 | -0.1 | -0.1 | -0.1 |
| Net income (loss) attributable to Landsea Homes Corporation | 77.2 | 72.9 | 52.8 | 25.1 | 17.4 | -13.5 | -9.0 | -19.3 |
| |
| Earnings (loss) per share: | | | | | | | | |
| Basic (in dollars per share) | $1.68 | $1.57 | $1.13 | $0.63 | $0.50 | ($0.35) | ($0.27) | ($0.60) |
| Diluted (in dollars per share) | $1.68 | $1.57 | $1.13 | $0.63 | $0.50 | ($0.35) | ($0.27) | ($0.60) |
| |
| Weighted average shares outstanding: | | | | | | | | |
| Basic (in shares) | 44.7 | 45.3 | 45.0 | 41.8 | 38.7 | 35.5 | 32.6 | 24.4 |
| Diluted (in shares) | 44.8 | 45.3 | 45.0 | 41.9 | 38.7 | 35.5 | 24.4 | 16.3 |
| Revenue | 1,297.5 | 1,179.1 | 1,023.3 | 909.6 | 913.9 | 758.7 | 734.6 | 449.9 |
| Revenue growth | 42.0% | 55.4% | 39.3% | 102.2% | 295.0% | 456.7% | 21045.9% | 12140.8% |
| Gross margin | 264.5 | 229.0 | 182.6 | 139.3 | 133.8 | 96.9 | 94.9 | 52.3 |
| Gross margin | 20.4% | 19.4% | 17.8% | 15.3% | 14.6% | 12.8% | 12.9% | 11.6% |
| |
| Inventory impairments | | | | | | | | |
| Total cost of sales | 1,033.0 | 950.2 | 840.7 | 770.2 | 780.2 | 661.8 | 639.7 | 397.6 |