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Reconciliation of Actual Income Tax Expenses (Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Income Tax Disclosure [Abstract] |  |  |
Provision (benefit) for U.S federal income tax at statutory rate | $ (19,365) | $ (17,442) | $ 18,740
Effect of foreign income taxes | 630 | 249 | (629)
Manufacturers’/producers’ deduction |  |  | (1,496)
Research and experimentation tax credit | (686) | (400) | (208)
State income taxes, net of federal income tax benefit | 4 | 2 | 45
Nondeductible expenses | 149 | 488 | 205
Resolution of prior years’ tax matters |  | 96 | 20
Adjustment to prior year manufacturers’/producers’ deduction | 1,450 |  |
Correction of prior year income tax benefit | 950 |  |
Contingency for uncertainty in income taxes |  | (121) |
Change in valuation allowance | 7,715 |  |
Other items | (210) | (65) | (45)
Income tax expense | $ (9,363) | $ (17,193) | $ 16,632
Effective tax rate | (14.10%) | (34.50%) | 31.10%

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