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Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Deferred tax assets: |  |
Inventory costs | $ 87.6 | $ 113.7
Inventory impairments | 128.3 | 180.4
Warranty and construction defect costs | 138.8 | 127.1
Net operating loss carryforwards | 40.1 | 58.5
Tax credit carryforwards | 2.9 | 7.6
Incentive compensation plans | 82.2 | 79.3
Deferral of profit on home sales | 2.2 | 2.0
Other | 11.1 | 14.4
Total deferred tax assets | 493.2 | 583.0
Valuation allowance | (10.3) | (10.1)
Total deferred tax assets, net of valuation allowance | 482.9 | 572.9
Deferred tax liabilities | 6.6 | 14.8
Deferred income taxes, net | $ 476.3 | $ 558.1

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