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, 2018
Sep. 30, 2017
Sep. 30, 2016
Change in plan assets:      
Fair value, beginning of year $ 155,634    
Fair value, end of year 158,662 $ 155,634  
Pension      
Change in benefit obligation:      
Benefit obligation, beginning of year 259,672 263,566  
Service cost 8,159 8,553 $ 7,446
Interest cost 8,210 7,362 9,725
Actuarial gain (15,229) (4,264)  
Exchange (gain) loss (180) 589  
Benefit payments (19,079) (16,134)  
Benefit obligation, end of year 241,553 259,672 263,566
Change in plan assets:      
Fair value, beginning of year 155,634 151,864  
Actual return 10,914 12,586  
Benefit payments (19,079) (16,134)  
Employer contributions 11,193 7,318  
Fair value, end of year 158,662 155,634 151,864
Funded status (82,892) (104,039)  
Amounts recognized in the consolidated balance sheet:      
Current liability (857) (766)  
Noncurrent benefit liability (82,035) (103,273)  
Accumulated other comprehensive loss (income) 52,853 72,926  
Net amount recognized (30,039) (31,113)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss (income) 53,405 73,616  
Prior service cost (552) (690)  
Distributions to terminated employees 6,800 5,655  
Other Postretirement      
Change in benefit obligation:      
Benefit obligation, beginning of year 20,316 23,290  
Service cost 335 392 402
Interest cost 631 626 845
Actuarial gain (907) (2,600)  
Exchange (gain) loss 0 0  
Benefit payments (1,549) (1,392)  
Benefit obligation, end of year 18,826 20,316 23,290
Change in plan assets:      
Fair value, beginning of year 0 0  
Actual return 0 0  
Benefit payments (1,549) (1,392)  
Employer contributions 1,549 1,392  
Fair value, end of year 0 0 $ 0
Funded status (18,828) (20,317)  
Amounts recognized in the consolidated balance sheet:      
Current liability (1,075) (1,044)  
Noncurrent benefit liability (17,753) (19,273)  
Accumulated other comprehensive loss (income) (2,901) (2,189)  
Net amount recognized (21,729) (22,506)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss (income) (2,376) (1,469)  
Prior service cost $ (525) $ (720)