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Net Periodic Benefit Cost for Period Reconciliation of Changes in Plan Assets Projected Benefit Obligations and Amounts Recognized in Other Comprehensive Income and Accumulated Other Comprehensive Income (Detail) - Frozen Defined Benefit Pension Plans - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Net Periodic Pension Cost in Income Statement        
Net Periodic Pension Cost in Income Statement, Interest cost $ 2,133 $ 2,312 $ 1,560  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Income (Expense), Operating and Nonoperating Interest Income (Expense), Operating and Nonoperating Interest Income (Expense), Operating and Nonoperating  
Net Periodic Pension Cost in Income Statement, Actual return on plan assets $ (6,672) $ (1,196) $ 13,151  
Net Periodic Pension Cost in Income Statement, Difference between actual and expected return on plan assets 4,558 (635) (15,200)  
Net Periodic Pension Cost in Income Statement, Amortization of unrecognized net actuarial loss 1,277 1,526 896  
Net Periodic Pension Cost in Income Statement, Annual cost/change 1,296 2,007 407  
Cash        
Cash, Employer contributions/ Annual cost/change   (64)    
Fair Value of Pension Plan Assets        
Fair Value of Pension Plan Assets, Beginning Balance 44,206 47,454 65,337  
Fair Value of Pension Plan Assets, Actual return on plan assets 6,672 1,196 (13,151)  
Fair Value of Pension Plan Assets, Employer contributions   64    
Fair Value of Pension Plan Assets, Benefit payments (3,649) (3,936) (4,225)  
Fair Value of Pension Plan Assets, Investment and other expenses (239) (572) (507)  
Fair Value of Pension Plan Assets, Annual cost/change 2,784 (3,248) (17,883)  
Fair Value of Pension Plan Assets, Ending Balance 46,990 44,206 47,454  
Projected Benefit Obligation        
Projected Benefit Obligation, Beginning balance (41,485) (44,253) (61,294)  
Projected Benefit Obligation, Interest cost (2,133) (2,312) (1,560)  
Projected Benefit Obligation, Benefit payments 3,649 3,936 4,225  
Projected Benefit Obligation, Investment and other expenses 239 572 507  
Projected Benefit Obligation, Actuarial (loss) gain (4,544) 572 13,869  
Projected Benefit Obligation, Annual cost/change (2,789) 2,768 17,041  
Projected Benefit Obligation, Ending balance (44,274) (41,485) (44,253)  
Funded status at the end of the year 2,716 2,721 3,201 $ 4,043
Other Comprehensive (Income) / Loss        
Other Comprehensive (Income) / Loss, Difference between actual and expected return on plan assets (4,558) 635 15,200  
Other Comprehensive (Income) / Loss, Actuarial loss (gain) 4,544 (572) (13,869)  
Other Comprehensive (Income) / Loss, Amortization of unrecognized net actuarial loss (1,277) (1,526) (896)  
Other Comprehensive (Income) / Loss, Annual cost/change (1,291) (1,463) 435  
Gross Pension Related Accumulated Other Comprehensive Income        
Gross Pension Related Accumulated Other Comprehensive Income, Beginning Balance 10,465 11,928 11,493  
Other Comprehensive (Income) / Loss, Annual cost/change (1,291) (1,463) 435  
Gross Pension Related Accumulated Other Comprehensive Income, Ending Balance $ 9,174 $ 10,465 $ 11,928