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Summary of Significant Accounting Policies Change in Accounting Estimate (Details) (USD $) | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Write-down of inventory | $ 10,380,000 | $ 1,167,000 | $ 582,000
Losses on inventory purchase commitments | 2,455,000 | 0 | 0
Decrease (Increase) In Operating Income (Loss) Including Poriton Attributable To Noncontrolling Interest | 12,800,000 |  |
Decrease (Increase) In Operating Income (Loss) Attributable To Parent | $ 9,700,000 |  |
Earnings Per Share Basic And Diluted Increse (Decrease) | $ 1.01 |  |

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