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Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Deferred tax assets: |  |
Inventory costs | $ 37.6 | $ 39.8
Inventory impairments | 21.5 | 27.9
Warranty and construction defect costs | 156.7 | 135.1
Net operating loss carryforwards | 17.5 | 31.5
Tax credit carryforwards | 2.1 | 3.5
Incentive compensation plans | 68.3 | 65.1
Other | 15.6 | 7.2
Total deferred tax assets | 319.3 | 310.1
Valuation allowance | (7.5) | (18.7)
Total deferred tax assets, net of valuation allowance | 311.8 | 291.4
Deferred tax liabilities: |  |
Deferral of profit on home sales | 131.9 | 95.4
Deferred Tax Liabilities, Property, Plant and Equipment | 19.0 | 14.2
Other | 16.0 | 18.7
Total deferred tax liabilities | 166.9 | 128.3
Deferred income taxes, net | $ 144.9 | $ 163.1

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