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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  | $ 862 | $ 572 |
Net tax benefit mostly related to reversal of tax reserves for federal income tax audit | $ 400 | $ 500 | $ 100 | $ 1,100 | $ 200 | 900 | 1,400 | $ 800
Interest and penalties related to income tax matters in income tax expense |  |  |  |  |  | (100) | (200) |
Accrued income tax penalties and interest for unrecognized tax benefits |  |  |  |  |  | 300 | $ 400 |
Accumulated undistributed foreign earnings |  |  |  |  |  | 28,200 |  |
Maximum |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Estimated unrecognized deferred tax liability |  |  |  |  |  | 800 |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
State research and development tax credits |  |  |  |  |  | 700 |  |
Foreign Tax Authority |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Non-U.S. operating losses |  |  |  |  |  | $ 500 |  |

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