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, 2019
Sep. 30, 2018
Sep. 30, 2017
Change in plan assets:      
Fair value, beginning of year $ 158,662    
Fair value, end of year 155,313 $ 158,662  
Pension      
Change in benefit obligation:      
Benefit obligation, beginning of year 241,553 259,672  
Service cost 7,998 8,159 $ 8,553
Interest cost 9,202 8,210 7,362
Actuarial loss (gain) 43,198 (15,229)  
Exchange gain (581) (180)  
Benefit payments (11,413) (19,079)  
Benefit obligation, end of year 289,957 241,553 259,672
Change in plan assets:      
Fair value, beginning of year 158,662 155,634  
Actual return 6,852 10,914  
Benefit payments (11,413) (19,079)  
Employer contributions 1,212 11,193  
Fair value, end of year 155,313 158,662 155,634
Funded status (134,644) (82,892)  
Amounts recognized in the consolidated balance sheet:      
Current liability (882) (857)  
Noncurrent benefit liability (133,762) (82,035)  
Accumulated other comprehensive loss (income) (95,374) (52,853)  
Net amount recognized (39,270) (30,039)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss (income) 95,741 53,405  
Prior service cost (367) (552)  
Distributions to terminated employees   6,800  
Other Postretirement      
Change in benefit obligation:      
Benefit obligation, beginning of year 18,826 20,316  
Service cost 244 335 392
Interest cost 718 631 626
Actuarial loss (gain) 2,212 (907)  
Exchange gain 0 0  
Benefit payments (1,048) (1,549)  
Benefit obligation, end of year 20,952 18,826 20,316
Change in plan assets:      
Fair value, beginning of year 0 0  
Actual return 0 0  
Benefit payments (1,048) (1,549)  
Employer contributions 1,048 1,549  
Fair value, end of year 0 0 $ 0
Funded status (20,952) (18,828)  
Amounts recognized in the consolidated balance sheet:      
Current liability (989) (1,075)  
Noncurrent benefit liability (19,963) (17,753)  
Accumulated other comprehensive loss (income) 436 2,901  
Net amount recognized (21,388) (21,729)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss (income) (106) (2,376)  
Prior service cost $ (330) $ (525)