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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Deferred tax assets: |  |
Federal and state tax carryforwards | $ 196,702 | $ 293,298
Inventory adjustments | 29,565 | 59,507
Incentive compensation | 11,959 | 19,043
Warranty and other reserves | 6,350 | 6,140
Property, equipment and other assets | 2,123 | 3,247
Other | 734 | 1,785
Uncertain tax positions | 734 | 1,332
Total deferred tax assets | 248,167 | 384,352
Deferred tax liabilities: |  |
Deferred revenues | 0 | (11,297)
Total deferred tax liabilities | 0 | (11,297)
Net deferred tax assets before valuation allowance | 248,167 | 373,055
Valuation allowance | (34,212) | (65,159)
Net deferred tax assets | $ 213,955 | $ 307,896

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