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Summary of Significant Accounting Policies - Reclassification Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2024
Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                    
Income tax expense                 $ 37 $ 16
Net loss $ 443 $ (72) $ 1,590 $ 3,422 $ 3,102 $ 634 $ 2,367 $ 2,589 5,383 8,692
Amount reclassified from accumulated other comprehensive loss | Net actuarial gain                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                    
Total before taxes                 844 1,660
Amount reclassified from accumulated other comprehensive loss | Settlements/curtailments                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                    
Total before taxes                 60 108
Amount reclassified from accumulated other comprehensive loss | Retirement Plan Liability Adjustment                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                    
Total before taxes                 904 1,768
Income tax expense                 0 0
Net loss                 $ 904 $ 1,768