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Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Deferred tax assets: |  |
Inventory costs | $ 42.6 | $ 87.6
Inventory impairments | 83.9 | 128.3
Warranty and construction defect costs | 163.7 | 138.8
Net operating loss carryforwards | 26.2 | 40.1
Tax credit carryforwards | 2.5 | 2.9
Incentive compensation plans | 92.6 | 82.2
Deferral of profit on home sales | 1.7 | 2.2
Other | 13.9 | 11.1
Total deferred tax assets | 427.1 | 493.2
Valuation allowance | (11.2) | (10.3)
Total deferred tax assets, net of valuation allowance | 415.9 | 482.9
Deferred Tax Liabilities, Tax Deferred Income | 41.6 | 0.0
Deferred Tax Liabilities, Other | 9.3 | 6.6
Other | 50.9 | 6.6
Deferred income taxes, net | $ 365.0 | $ 476.3

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