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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Deferred Tax Assets: |  |
Warranty and other reserves | $ 11,559 | $ 12,408
Incentive compensation | 17,368 | 16,285
Property, equipment and other assets | 2,455 | 2,647
Federal and state carryforwards | 383,508 | 365,283
Inventory adjustments | 114,416 | 133,843
Uncertain tax positions | 14,415 | 16,331
Other | 3,052 | 4,285
Total deferred tax assets | 546,773 | 551,082
Deferred Tax Liabilities: |  |
Deferred revenues | (54,257) | (56,017)
Total deferred tax liabilities | (54,257) | (56,017)
Net deferred tax assets before valuation allowance | 492,516 | 495,065
Valuation allowance | (487,263) | (488,217)
Net deferred tax assets | $ 5,253 | $ 6,848

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