XML 89 R78.htm IDEA: XBRL DOCUMENT v3.22.2.2
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, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Net Periodic Pension Cost in Income Statement        
Net Periodic Pension Cost in Income Statement, Interest cost $ 1,560 $ 1,541 $ 1,875  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Revenue (Expense), Net Interest Revenue (Expense), Net Interest Revenue (Expense), Net  
Net Periodic Pension Cost in Income Statement, Actual return on plan assets $ (13,658) $ (678) $ (6,538)  
Net Periodic Pension Cost in Income Statement, Investment and other expenses (507) (377) (539)  
Net Periodic Pension Cost in Income Statement, Difference between actual and expected return on plan assets (15,200) (1,386)   $ 4,268
Net Periodic Pension Cost in Income Statement, Anticipated expenses   345 334  
Net Periodic Pension Cost in Income Statement, Amortization of unrecognized net actuarial loss 896 937 1,617  
Net Periodic Pension Cost in Income Statement, Annual cost/change 407 382 1,017  
Fair Value of Pension Plan Assets        
Fair Value of Pension Plan Assets, Beginning Balance 65,337 69,088 66,838  
Fair Value of Pension Plan Assets, Actual return on plan assets (13,658) 678 6,538  
Fair Value of Pension Plan Assets, Benefit payments (4,225) (4,429) (4,288)  
Fair Value of Pension Plan Assets, Annual cost/change (17,883) (3,751) 2,250  
Fair Value of Pension Plan Assets, Ending Balance 47,454 65,337 69,088 66,838
Projected Benefit Obligation        
Projected Benefit Obligation, Beginning balance (61,294) (65,398) (65,007)  
Projected Benefit Obligation, Interest cost (1,560) 1,541 (1,875)  
Projected Benefit Obligation, Benefit payments 4,225 4,429 4,288  
Projected Benefit Obligation, Investment and other expenses 507 377 539  
Projected Benefit Obligation , Anticipated expenses   345 334  
Projected Benefit Obligation, Actuarial (loss) gain 13,869 1,184 (3,009)  
Projected Benefit Obligation, Annual cost/change 17,041 4,104 (391)  
Projected Benefit Obligation, Ending balance (44,253) (61,294) (65,398) (65,007)
Funded status at the end of the year 3,201 4,043 3,690  
Other Comprehensive (Income) / Loss        
Other Comprehensive (Income) / Loss, Difference between actual and expected return on plan assets 15,200 1,386   (4,268)
Other Comprehensive (Income) / Loss, Actuarial loss (gain) (13,869) 1,184 (3,009)  
Other Comprehensive (Income) / Loss, Amortization of unrecognized net actuarial loss (896) (937) (1,617)  
Other Comprehensive (Income) / Loss, Annual cost/change 435 (735) (2,876)  
Gross Pension Related Accumulated Other Comprehensive Income        
Gross Pension Related Accumulated Other Comprehensive Income, Beginning Balance 11,493 12,228 15,104  
Other Comprehensive (Income) / Loss, Annual cost/change 435 (735) (2,876)  
Gross Pension Related Accumulated Other Comprehensive Income, Ending Balance $ 11,928 $ 11,493 $ 12,228 $ 15,104