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Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
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

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