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, 2020
Sep. 30, 2019
Sep. 30, 2018
Change in plan assets:      
Fair value, beginning of year $ 155,313    
Fair value, end of year 168,134 $ 155,313  
Amounts recognized in accumulated other comprehensive loss (income):      
Equity and fixed income mutual funds 24,610 22,986  
Pension      
Change in benefit obligation:      
Benefit obligation, beginning of year 289,957 241,553  
Service cost 8,679 7,998 $ 8,159
Interest cost 7,735 9,202 8,210
Actuarial loss (gain) 23,827 43,198  
Exchange loss (gain) 799 (581)  
Benefit payments (12,110) (11,413)  
Benefit obligation, end of year 318,887 289,957 241,553
Change in plan assets:      
Fair value, beginning of year 155,313 158,662  
Actual return 8,705 6,852  
Benefit payments (12,110) (11,413)  
Employer contributions 16,226 1,212  
Fair value, end of year 168,134 155,313 158,662
Funded status (1) (150,753) (134,644)  
Amounts recognized in the consolidated balance sheet:      
Current liability (905) (882)  
Noncurrent benefit liability (149,848) (133,762)  
Accumulated other comprehensive loss (income) (111,314) (95,374)  
Net amount recognized (39,439) (39,270)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss (income) 110,971 95,741  
Prior service cost 343 (367)  
Other Postretirement      
Change in benefit obligation:      
Benefit obligation, beginning of year 20,952 18,826  
Service cost 227 244 335
Interest cost 501 718 631
Actuarial loss (gain) (1,402) 2,212  
Exchange loss (gain) 0 0  
Benefit payments (847) (1,048)  
Benefit obligation, end of year 19,431 20,952 18,826
Change in plan assets:      
Fair value, beginning of year 0 0  
Actual return 0 0  
Benefit payments (847) (1,048)  
Employer contributions 847 1,048  
Fair value, end of year 0 0 $ 0
Funded status (1) (19,431) (20,952)  
Amounts recognized in the consolidated balance sheet:      
Current liability (831) (989)  
Noncurrent benefit liability (18,600) (19,963)  
Accumulated other comprehensive loss (income) 1,372 436  
Net amount recognized (20,803) (21,388)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss (income) 676 (106)  
Prior service cost $ (2,048) $ (330)