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, 2017
Sep. 30, 2016
Sep. 30, 2015
Change in plan assets:      
Fair value, beginning of year $ 151,864    
Fair value, end of year 155,634 $ 151,864  
Pension      
Change in benefit obligation:      
Benefit obligation, beginning of year 263,566 238,727  
Service cost 8,553 7,446 $ 6,764
Interest cost 7,362 9,725 8,740
Actuarial (gain) loss (4,264) 26,841  
Exchange loss (gain) 589 (6)  
Benefit payments (16,134) (19,167)  
Benefit obligation, end of year 259,672 263,566 238,727
Change in plan assets:      
Fair value, beginning of year 151,864 142,225  
Actual return 12,586 11,244  
Benefit payments (16,134) (19,167)  
Employer contributions 7,318 17,562  
Fair value, end of year 155,634 151,864 142,225
Funded status (104,039) (111,701)  
Amounts recognized in the consolidated balance sheet:      
Current liability (766) (760)  
Noncurrent benefit liability (103,273) (110,941)  
Accumulated other comprehensive loss (income) 72,926 91,262  
Net amount recognized (31,113) (20,439)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss (income) 73,616 92,310  
Prior service cost (690) (1,048)  
Distributions to terminated employees 5,655 9,300  
Other Postretirement      
Change in benefit obligation:      
Benefit obligation, beginning of year 23,290 20,424  
Service cost 392 402 454
Interest cost 626 845 885
Actuarial (gain) loss (2,600) 2,931  
Exchange loss (gain) 0 0  
Benefit payments (1,392) (1,312)  
Benefit obligation, end of year 20,316 23,290 20,424
Change in plan assets:      
Fair value, beginning of year 0 0  
Actual return 0 0  
Benefit payments (1,392) (1,312)  
Employer contributions 1,392 1,312  
Fair value, end of year 0 0 $ 0
Funded status (20,317) (23,291)  
Amounts recognized in the consolidated balance sheet:      
Current liability (1,044) (1,148)  
Noncurrent benefit liability (19,273) (22,143)  
Accumulated other comprehensive loss (income) (2,189) 214  
Net amount recognized (22,506) (23,077)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss (income) (1,469) 1,130  
Prior service cost $ (720) $ (916)