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Pension and Retirement Plans - Fair value of plan assets (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2024
GBP (£)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
Sep. 30, 2024
USD ($)
Pension and Retirement Plans        
Fair value of the assets   $ 9,028   $ 11,366
Company contributions | £ £ 0.6      
Cash on deposit        
Pension and Retirement Plans        
Fair value of the assets   183   65
Fixed income        
Pension and Retirement Plans        
Fair value of the assets   0   10,388
Buy-in contract*        
Pension and Retirement Plans        
Fair value of the assets   8,845   0
Acquisition of buy-in contract | £ £ 8.5      
Equity        
Pension and Retirement Plans        
Fair value of the assets   0   913
Level 1        
Pension and Retirement Plans        
Fair value of the assets   183   9,042
Level 1 | Cash on deposit        
Pension and Retirement Plans        
Fair value of the assets   183   65
Level 1 | Fixed income        
Pension and Retirement Plans        
Fair value of the assets   0   8,714
Level 1 | Buy-in contract*        
Pension and Retirement Plans        
Fair value of the assets   0   0
Level 1 | Equity        
Pension and Retirement Plans        
Fair value of the assets   0   263
Level 2        
Pension and Retirement Plans        
Fair value of the assets   0   2,324
Level 2 | Cash on deposit        
Pension and Retirement Plans        
Fair value of the assets   0   0
Level 2 | Fixed income        
Pension and Retirement Plans        
Fair value of the assets   0   1,674
Level 2 | Buy-in contract*        
Pension and Retirement Plans        
Fair value of the assets   0   0
Level 2 | Equity        
Pension and Retirement Plans        
Fair value of the assets   0   650
Level 3        
Pension and Retirement Plans        
Fair value of the assets   8,845   0
Level 3 | Cash on deposit        
Pension and Retirement Plans        
Fair value of the assets   0   0
Level 3 | Fixed income        
Pension and Retirement Plans        
Fair value of the assets   0   0
Level 3 | Buy-in contract*        
Pension and Retirement Plans        
Fair value of the assets   $ 8,845   $ 0
Expected term on plan assets   20 years    
Expected return on plan assets     5.20% 4.50%
Level 3 | Equity        
Pension and Retirement Plans        
Fair value of the assets   $ 0   $ 0