Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT PLANS - Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Details)

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PENSION AND OTHER POSTRETIREMENT PLANS - Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Pension      
Change in benefit obligation:      
Benefit obligation, beginning of year $ 36,609 $ 293,926  
Acquisitions 0 9,829  
Service cost 163 392 $ 7,919
Interest cost 497 1,127 6,145
Actuarial gain (512) (19,978)  
Settlement (24,242) (242,232)  
Exchange loss (gain) 979 (3,093)  
Benefit payments (598) (3,362)  
Benefit obligation, end of year 12,896 36,609 293,926
Change in plan assets:      
Fair value, beginning of year 0 208,344  
Actual return 0 368  
Benefit payments (598) (3,362)  
Employer contributions 24,840 36,882  
Settlement (24,242) (242,232)  
Fair value, end of year 0 0 208,344
Funded status (12,896) (36,609)  
Amounts recognized in the consolidated balance sheet:      
Current liability (68) (24,172)  
Noncurrent benefit liability (12,828) (12,437)  
Accumulated other comprehensive (income) loss (1,518) 325  
Net amount recognized (14,414) (36,284)  
Amounts recognized in accumulated other comprehensive loss (income):      
Actuarial loss (1,518) 5,140  
Prior service (credit) cost 0 (4,815)  
Other Postretirement      
Change in benefit obligation:      
Benefit obligation, beginning of year 12,813 18,841  
Acquisitions 0 0  
Service cost 76 165 201
Interest cost 644 411 376
Actuarial gain (641) (5,989)  
Settlement 0 0  
Exchange loss (gain) 0 0  
Benefit payments (517) (615)  
Benefit obligation, end of year 12,375 12,813 18,841
Change in plan assets:      
Fair value, beginning of year 0 0  
Actual return 0 0  
Benefit payments (517) (615)  
Employer contributions 517 615  
Settlement 0 0  
Fair value, end of year 0 0 $ 0
Funded status (12,375) (12,813)  
Amounts recognized in the consolidated balance sheet:      
Current liability (876) (830)  
Noncurrent benefit liability (11,499) (11,983)  
Accumulated other comprehensive (income) loss (6,862) (7,293)  
Net amount recognized (19,237) (20,106)  
Amounts recognized in accumulated other comprehensive loss (income):      
Actuarial loss (5,906) (5,973)  
Prior service (credit) cost $ (956) $ (1,320)