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Pension and Retirement Plans - Components of net periodic benefit costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in minimum liability included in other comprehensive income (loss) $ (1,972) $ (150)
U.K.    
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in minimum liability included in other comprehensive income (loss) (1,794) (231)
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in minimum liability included in other comprehensive income (loss) (178) 81
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 254 278
Expected return on plan assets (398) (289)
Amortization of past service costs 7 7
Amortization of net gain (loss) 185 193
Net periodic benefit cost 48 189
Increase (decrease) in minimum liability included in other comprehensive income (loss) (1,802) (229)
Pension | International    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 243 263
Pension | U.K.    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 243 263
Expected return on plan assets (398) (289)
Amortization of past service costs 7 7
Amortization of net gain (loss) 181 190
Net periodic benefit cost 33 171
Increase (decrease) in minimum liability included in other comprehensive income (loss) (1,794) (231)
Pension | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 11 15
Amortization of net gain (loss) 4 3
Net periodic benefit cost 15 18
Increase (decrease) in minimum liability included in other comprehensive income (loss) (8) 2
Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 45 38
Interest cost 42 46
Amortization of net gain (loss) 50 24
Net periodic benefit cost 137 108
Increase (decrease) in minimum liability included in other comprehensive income (loss) (170) 79
Post Retirement | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 45 38
Interest cost 42 46
Amortization of net gain (loss) 50 24
Net periodic benefit cost 137 108
Increase (decrease) in minimum liability included in other comprehensive income (loss) $ (170) $ 79