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Income Tax Expense - Additional information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Expense [Line Items] |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | $ 0 | $ 100,000 | $ 100,000
Operating Loss Carryforwards, Valuation Allowance |  | 600,000 | 600,000 |
Net operating loss carryforward - foreign |  | 3,766,000 | 4,603,000 |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration |  | 16,000,000.0 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 600,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  | 600,000 |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research |  | 1,900,000 |  |
State Research And Other Credit Carryforwards, With Expiration Date |  | 1,400,000 |  |
State Research And Other Credit Carry Forwards Without Expiration Date |  | 500,000 |  |
Deferred Tax Assets, Valuation Allowance |  | 4,520,000 | 7,144,000 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 2,600,000 | $ 2,700,000 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 24.50% | 35.00%
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 2,700,000 | $ 10,200,000 |
Accrued interest related to uncertain tax positions |  | 0 |  |
Penalties have been accrued |  | 0 |  |
Excess Foreign Tax Credits |  |  |  |
Income Tax Expense [Line Items] |  |  |  |
Tax Credit Carryforward, Amount |  | 0 | 2,400,000 |
Foreign Valuation Allowance |  |  |  |
Income Tax Expense [Line Items] |  |  |  |
Operating Loss Carryforwards, Valuation Allowance |  | 3,600,000 | 3,800,000 |
State and Local Jurisdiction |  |  |  |
Income Tax Expense [Line Items] |  |  |  |
Operating Loss Carryforwards, Valuation Allowance |  | 400,000 | $ 400,000 |
Net operating loss carryforward - foreign |  | $ 16,600,000 |  |
Tax Cuts And Jobs Act |  |  |  |
Income Tax Expense [Line Items] |  |  |  |
Effective Income Taxes Foreign Withholding Taxes | $ 0 |  |  |

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