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Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Retirement Benefits [Abstract]        
Service cost $ 26 $ 85 $ 52 $ 170
Interest cost 175 208 350 416
Expected return on plan assets (355) (363) (711) (727)
Amortization of net loss 211 188 423 376
Net periodic cost $ 57 $ 118 $ 114 $ 235