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RETIREMENT PLANS - NARRATIVE (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Retirement plans    
Curtailment gain and gain on termination of post-retirement medical plan in OCI $ 541 $ 1,726
Gain on termination of post-retirement medical plan $ 2,341 0
Pension Plan    
Retirement plans    
Period of employee's highest average earnings on which benefits are based 5 years  
Expected future contributions $ 0  
Accumulated benefit obligation $ 10,365 10,280
Post-retirement Medical    
Retirement plans    
Minimum period of service to be attained for being covered under the plan 20 years  
Minimum period of service to be attained at the position of Vice President or higher for being covered under the plan 10 years  
Curtailment gain and gain on termination of post-retirement medical plan in OCI $ 541 0
Gain on termination of post-retirement medical plan 2,341  
Pension Plan And Supplemental Employee Retirement Plan    
Retirement plans    
Curtailment gain and gain on termination of post-retirement medical plan in OCI 0 1,726
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax   1,726
SERP    
Retirement plans    
Accumulated benefit obligation $ 2,136 $ 2,031