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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
--- | --- | ---
Deferred tax assets: |  |
Warranty and other reserves | $ 11,587 | $ 11,559
Incentive compensation | 18,993 | 17,368
Property, equipment and other assets | 2,750 | 2,455
Federal and state tax carryforwards | 357,146 | 383,508
Inventory adjustments | 95,237 | 114,416
Uncertain tax positions | 1,911 | 14,415
Other | 3,923 | 3,052
Total deferred tax assets | 491,547 | 546,773
Deferred tax liabilities: |  |
Deferred revenues | (43,496) | (54,257)
Total deferred tax liabilities | (43,496) | (54,257)
Net deferred tax assets before valuation allowance | 448,051 | 492,516
Valuation allowance | (445,228) | (487,263)
Net deferred tax assets | $ 2,823 | $ 5,253

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