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Retirement Benefit Plans - Asset Allocation of Defined Benefit Pension Plan Assets and Fair Values and Levels in Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 18,376 $ 17,194 $ 17,937
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 18,376 17,194  
Large value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value   879  
Large value | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value   879  
Large blend      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 3,796 3,124  
Large blend | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 3,796 3,124  
Large growth      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 1,458 1,060  
Large growth | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 1,458 1,060  
Mid blend      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 775 599  
Mid blend | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 775 599  
Small blend      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 633 499  
Small blend | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 633 499  
Foreign large blend      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 770 615  
Foreign large blend | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 770 615  
Diversified emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 338 272  
Diversified emerging markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 338 272  
Global equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 702 577  
Global equity securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 702 577  
Intermediate term bond      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 5,764 5,676  
Intermediate term bond | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 5,764 5,676  
Multi-sector bond      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 3,697    
Multi-sector bond | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 3,697    
High inflation bond      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value   2,044  
High inflation bond | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value   2,044  
Cash or money market      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 443    
Cash or money market | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 443    
Short-term bonds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value   1,849  
Short-term bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value   $ 1,849