Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT PLANS - Changes in Fair Value of Level 3 Plan Assets (Details)

v3.20.2
PENSION AND OTHER POSTRETIREMENT PLANS - Changes in Fair Value of Level 3 Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value, beginning of year $ 155,313  
Fair value, end of year 168,134 $ 155,313
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value, beginning of year 10,860  
Fair value, end of year 15,273 10,860
Pension    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value, beginning of year 155,313 158,662
Fair value, end of year 168,134 155,313
Pension | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value, beginning of year 10,860 10,115
Acquisitions 10,835 4,162
Dispositions (6,326) (2,786)
Realized Gains 220 685
Unrealized Gains (Losses) (316) (1,316)
Fair value, end of year $ 15,273 $ 10,860