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Summary of Significant Accounting Policies Change in Accounting Estimate (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Change in Accounting Estimate [Line Items] |  |  |
Write-down of inventory | $ 138 | $ 294 | $ 3,652
Inventory Valuation and Obsolescence |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Write-down of inventory | $ 100 | $ 300 | 3,700
Decrease (Increase) In Operating Income (Loss) Attributable To Parent |  |  | $ 3,700
Earnings Per Share Basic And Diluted Increase (Decrease) | $ 0.01 | $ 0.03 | $ 0.39

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