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Defined Benefit Pension Plan (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2020 GBP (£)
Retirement Benefits [Abstract] |  |  |  |  |
Guarantee obligation value, maximum | £ |  |  |  |  | £ 10,000,000
Service cost | $ 0 | $ 0 | $ 0 | $ 0 |
Interest cost | 109 | 154 | 217 | 311 |
Expected return on plan assets | (204) | (229) | (404) | (473) |
Amortization of prior service cost | 5 | 0 | 10 | 0 |
Total net periodic (benefit) | $ (90) | $ (75) | $ (177) | $ (162) |

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