Annual report pursuant to Section 13 and 15(d)

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

v3.21.2
PENSION AND OTHER POSTRETIREMENT PLANS - Changes in Fair Value of Level 3 Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value, beginning of year $ 168,134  
Fair value, end of year 208,344 $ 168,134
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value, beginning of year 15,273  
Fair value, end of year 14,311 15,273
Pension    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value, beginning of year 168,134 155,313
Fair value, end of year 208,344 168,134
Pension | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value, beginning of year 15,273 10,860
Acquisitions 236 10,835
Dispositions (2,144) (6,326)
Realized Gains 272 220
Unrealized Gains (Losses) 674 (316)
Fair value, end of year $ 14,311 $ 15,273