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, 2021
Sep. 30, 2020
Sep. 30, 2019
Change in plan assets:      
Fair value, beginning of year $ 168,134    
Fair value, end of year 208,344 $ 168,134  
Amounts recognized in accumulated other comprehensive loss (income):      
Assets held-in-trust 26,103 24,610  
Pension      
Change in benefit obligation:      
Benefit obligation, beginning of year 318,887 289,957  
Service cost 7,919 8,679 $ 7,998
Interest cost 6,145 7,735 9,202
Actuarial (gain) loss (8,045) 23,827  
Curtailment gain (17,324) 0  
Special termination benefits 315 0  
Exchange (gain) loss (133) 799  
Benefit payments (13,838) (12,110)  
Benefit obligation, end of year 293,926 318,887 289,957
Change in plan assets:      
Fair value, beginning of year 168,134 155,313  
Actual return 37,789 8,705  
Benefit payments (13,838) (12,110)  
Employer contributions 16,259 16,226  
Fair value, end of year 208,344 168,134 155,313
Funded status (85,582) (150,753)  
Amounts recognized in the consolidated balance sheet:      
Current liability (779) (905)  
Noncurrent benefit liability (84,803) (149,848)  
Accumulated other comprehensive loss (income) 49,236 111,314  
Net amount recognized (36,346) (39,439)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss 49,545 110,971  
Prior service (credit) cost (309) 343  
Other Postretirement      
Change in benefit obligation:      
Benefit obligation, beginning of year 19,431 20,952  
Service cost 201 227 244
Interest cost 376 501 718
Actuarial (gain) loss (660) (1,402)  
Curtailment gain 0 0  
Special termination benefits 0 0  
Exchange (gain) loss 0 0  
Benefit payments (507) (847)  
Benefit obligation, end of year 18,841 19,431 20,952
Change in plan assets:      
Fair value, beginning of year 0 0  
Actual return 0 0  
Benefit payments (507) (847)  
Employer contributions 507 847  
Fair value, end of year 0 0 $ 0
Funded status (18,841) (19,431)  
Amounts recognized in the consolidated balance sheet:      
Current liability (883) (831)  
Noncurrent benefit liability (17,958) (18,600)  
Accumulated other comprehensive loss (income) (1,668) (1,372)  
Net amount recognized (20,509) (20,803)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss 16 676  
Prior service (credit) cost $ (1,684) $ (2,048)