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Defined Benefit Pension Plan - Additional Information (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2021
GBP (£)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Defined benefit pension plan        
Defined benefit plan, funded status of plan   $ 1,253 $ 724  
Benefit obligation   $ 26,955 $ 26,047 $ 23,240
Defined benefit plan long term rate of improvement (as a percentage) 1.30%      
Maximum        
Defined benefit pension plan        
Expected contributions | £ £ 10,000,000      
Males        
Defined benefit pension plan        
Defined benefit plan mortality rate (as a percentage) 105.00%      
Females        
Defined benefit pension plan        
Defined benefit plan mortality rate (as a percentage) 105.00%