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Pension and Retirement Plans - Changes of the benefit obligation, the plan assets and funded status of the plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets, Beginning Balance $ 10,034  
Administrative expenses (143)  
Fair Value of Plan Assets, Ending Balance 11,366 $ 10,034
Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Administrative expenses (143)  
Pension:    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation, beginning of period 8,278 7,987
Interest cost 451 442
Changes in actuarial assumptions 350 (321)
Foreign exchange impact 788 759
Benefits paid (542) (589)
Projected benefit obligation, end of period 9,325 8,278
Fair Value of Plan Assets, Beginning Balance 10,034 8,825
Actual gain on plan assets 985 628
Company contributions 54 307
Foreign exchange impact 978 863
Benefits paid (542) (589)
Fair Value of Plan Assets, Ending Balance 11,366 10,034
Funded status \ net amount recognized 2,041 1,756
Pension: | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation, beginning of period 202 261
Interest cost 11 13
Changes in actuarial assumptions 1 (4)
Foreign exchange impact 0 0
Benefits paid (54) (68)
Projected benefit obligation, end of period 160 202
Fair Value of Plan Assets, Beginning Balance 0 0
Actual gain on plan assets 0 0
Company contributions 54 68
Foreign exchange impact 0 0
Benefits paid (54) (68)
Fair Value of Plan Assets, Ending Balance 0 0
Funded status \ net amount recognized (160) (202)
Pension: | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation, beginning of period 8,076 7,726
Interest cost 440 429
Changes in actuarial assumptions 349 (317)
Foreign exchange impact 788 759
Benefits paid (488) (521)
Projected benefit obligation, end of period 9,165 8,076
Fair Value of Plan Assets, Beginning Balance 10,034 8,825
Actual gain on plan assets 985 628
Company contributions   239
Foreign exchange impact 978 863
Benefits paid (488) (521)
Fair Value of Plan Assets, Ending Balance 11,366 10,034
Funded status \ net amount recognized 2,201 1,958
Post Retirement:    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation, beginning of period 1,147 1,186
Service cost 23 24
Interest cost 64 62
Changes in actuarial assumptions (12) (125)
Projected benefit obligation, end of period 1,222 1,147
Funded status \ net amount recognized (1,222) (1,147)
Post Retirement: | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation, beginning of period 1,147 1,186
Service cost 23 24
Interest cost 64 62
Changes in actuarial assumptions (12) (125)
Projected benefit obligation, end of period 1,222 1,147
Funded status \ net amount recognized (1,222) (1,147)
Post Retirement: | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation, beginning of period 0 0
Service cost 0 0
Interest cost 0 0
Changes in actuarial assumptions 0 0
Projected benefit obligation, end of period 0 0
Funded status \ net amount recognized $ 0 $ 0