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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2021
Income Tax Disclosure [Abstract] |
Components of income tax expense (benefit) | The components of the Company’s income tax expense are as follows:
| Year Ended September 30,
| 2021 |  | 2020 |  | 2019
| (In millions)
Current tax expense: |  |  |  |  |
Federal | $ | 978.1 |  |  | $ | 484.0 |  |  | $ | 407.3 |
State | 197.0 |  |  | 104.4 |  |  | 79.3 |
| 1,175.1 |  |  | 588.4 |  |  | 486.6 |
Deferred tax expense (benefit): |  |  |  |  |
Federal | (12.7) |  |  | 20.0 |  |  | 13.9 |
State | 2.7 |  |  | (5.9) |  |  | 6.2 |
| (10.0) |  |  | 14.1 |  |  | 20.1 |
Total income tax expense | $ | 1,165.1 |  |  | $ | 602.5 |  |  | $ | 506.7 |
Comparison of income tax expense (benefit) and tax computed at the statutory rate | Differences between income tax expense and tax computed by applying the federal statutory rate of 21% to income before income taxes during each year is due to the following:
| Year Ended September 30,
| 2021 |  | 2020 |  | 2019
| (In millions)
Income taxes at federal statutory rate | $ | 1,124.8 |  |  | $ | 626.4 |  |  | $ | 446.3 |
Increase (decrease) in tax resulting from: |  |  |  |  |
State income taxes, net of federal benefit | 166.9 |  |  | 79.1 |  |  | 69.1 |
Valuation allowance | (3.3) |  |  | (11.2) |  |  | (0.2) |
Tax credits | (116.3) |  |  | (93.4) |  |  | (1.6) |
Excess tax benefit from stock-based compensation | (38.4) |  |  | (22.3) |  |  | (16.1) |
Tax contingencies | (6.0) |  |  | 8.9 |  |  | — |
Other | 37.4 |  |  | 15.0 |  |  | 9.2 |
Total income tax expense | $ | 1,165.1 |  |  | $ | 602.5 |  |  | $ | 506.7 |
Components of deferred tax assets and liabilities | Components of deferred income taxes are summarized as follows:
| September 30,
| 2021 |  | 2020
| (In millions)
Deferred tax assets: |  |  |
Inventory costs | $ | 63.5 |  |  | $ | 37.6 |
Inventory impairments | 12.7 |  |  | 21.5 |
Warranty and construction defect costs | 190.5 |  |  | 156.7 |
Net operating loss carryforwards | 11.7 |  |  | 17.5 |
Tax credit carryforwards | 1.6 |  |  | 2.1 |
Incentive compensation plans | 77.5 |  |  | 68.3 |
Other | 15.6 |  |  | 15.6 |
Total deferred tax assets | 373.1 |  |  | 319.3 |
Valuation allowance | (4.2) |  |  | (7.5) |
Total deferred tax assets, net of valuation allowance | 368.9 |  |  | 311.8 |
Deferred tax liabilities: |  |  |
Deferral of profit on home closings | 166.7 |  |  | 131.9 |
Depreciation of fixed assets | 14.4 |  |  | 19.0 |
Other | 32.5 |  |  | 16.0 |
Total deferred tax liabilities | 213.6 |  |  | 166.9 |
Deferred income taxes, net | $ | 155.3 |  |  | $ | 144.9 |
Schedule of Unrecognized Tax Benefits Roll Forward | A reconciliation of the beginning and ending amounts of unrecognized tax benefits for fiscal 2021 and 2020 is as follows:
| Year Ended September 30,
| 2021 |  | 2020
| (In millions)
Unrecognized tax benefits, beginning of year | $ | 8.9 |  |  | $ | — |
Additions attributable to tax positions taken in the current year | 1.5 |  |  | 8.9 |
Additions attributable to tax positions taken in prior years | — |  |  | — |
Settlements | (7.5) |  |  | — |
Unrecognized tax benefits, end of year | $ | 2.9 |  |  | $ | 8.9 |

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