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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)