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RETIREMENT PLANS (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Change in Plan Assets:    
Fair value of plan assets at beginning of year $ 10,012  
Fair value of plan assets at end of year 10,192 $ 10,012
Amounts recognized in the Consolidated Balance Sheets:    
Noncurrent assets 0 848
Noncurrent liabilities $ (5,785) (4,410)
Pension Plan    
Retirement plans    
Period of employee's highest average earnings on which benefits are based 5 years  
Change in Projected Benefit Obligation:    
Benefit obligation at beginning of year $ 9,164 9,633
Service cost 189 216
Interest cost 372 355
Actuarial loss (gain) 1,426 (576)
Benefits paid (180) (464)
Benefit obligation at end of year 10,971 9,164
Change in Plan Assets:    
Fair value of plan assets at beginning of year 10,012 9,098
Actual return on plan assets 245 1,178
Employer contributions 115 200
Benefits paid (180) (464)
Fair value of plan assets at end of year 10,192 10,012
Funded status (779) 848
Amounts recognized in the Consolidated Balance Sheets:    
Noncurrent assets 0 848
Noncurrent liabilities (779) 0
Net amount (779) 848
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:    
Net actuarial loss 2,939 1,112
Prior service cost (credit) 54 59
Accumulated other comprehensive loss 2,993 $ 1,171
Other disclosures    
Expected contributions $ 0  
Assumptions used to determine fiscal year-end benefit obligations:    
Discount rate 3.06% 4.15%
Rate of compensation increase 4.00% 4.00%
Assumptions used to determine net benefit costs (years ended):    
Discount rate 4.15% 3.75%
Expected return on plan assets 6.50% 6.50%
Rate of compensation increase 4.00% 4.00%
Net periodic benefit cost for the year:    
Service cost $ 189 $ 216
Interest cost 372 355
Expected return on plan assets (648) (591)
Amortization of prior service cost (credit) 6 6
Amortization of net actuarial loss 2 99
Net periodic benefit (income) cost (79) 85
Amounts that are estimated to be amortized from accumulated other comprehensive loss into net periodic benefit cost in the next fiscal year    
Prior service cost (credit) 5  
Net actuarial loss (gain) 139  
Total amount 144  
Accumulated benefit obligation 9,600 8,122
Expected Benefit Payments:    
Fiscal year ending September 30, 2020 369  
Fiscal year ending September 30, 2021 378  
Fiscal year ending September 30, 2022 372  
Fiscal year ending September 30, 2023 443  
Fiscal year ending September 30, 2024 513  
Fiscal years ending September 30, 2025 through 2029 2,675  
SERP    
Change in Projected Benefit Obligation:    
Benefit obligation at beginning of year 2,039 1,605
Service cost 32 39
Interest cost 78 76
Actuarial loss (gain) 236 323
Benefits paid 0 (4)
Benefit obligation at end of year 2,385 2,039
Change in Plan Assets:    
Employer contributions 0 4
Benefits paid 0 (4)
Funded status (2,385) (2,039)
Amounts recognized in the Consolidated Balance Sheets:    
Current liabilities (2) (4)
Noncurrent liabilities (2,383) (2,035)
Net amount (2,385) (2,039)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:    
Net actuarial loss 497 260
Prior service cost (credit) (54) (59)
Accumulated other comprehensive loss $ 443 $ 201
Assumptions used to determine fiscal year-end benefit obligations:    
Discount rate 3.06% 4.15%
Rate of compensation increase 4.00% 4.00%
Assumptions used to determine net benefit costs (years ended):    
Discount rate 4.15% 3.75%
Rate of compensation increase 4.00% 4.00%
Net periodic benefit cost for the year:    
Service cost $ 32 $ 39
Interest cost 78 76
Amortization of prior service cost (credit) (6) (6)
Amortization of net actuarial loss 0 14
Net periodic benefit (income) cost 104 123
Amounts that are estimated to be amortized from accumulated other comprehensive loss into net periodic benefit cost in the next fiscal year    
Prior service cost (credit) (5)  
Net actuarial loss (gain) 19  
Total amount 14  
Accumulated benefit obligation 2,032 1,699
Expected Benefit Payments:    
Fiscal year ending September 30, 2020 2  
Fiscal year ending September 30, 2021 66  
Fiscal year ending September 30, 2022 66  
Fiscal year ending September 30, 2023 98  
Fiscal year ending September 30, 2024 130  
Fiscal years ending September 30, 2025 through 2029 $ 683  
Postretirement 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  
Change in Projected Benefit Obligation:    
Benefit obligation at beginning of year $ 2,382 2,029
Service cost 0 0
Interest cost 99 76
Actuarial loss (gain) 161 290
Benefits paid (9) (13)
Benefit obligation at end of year 2,633 2,382
Change in Plan Assets:    
Employer contributions 9 13
Benefits paid (9) (13)
Funded status (2,633) (2,382)
Amounts recognized in the Consolidated Balance Sheets:    
Current liabilities (10) (7)
Noncurrent liabilities (2,623) (2,375)
Net amount (2,633) (2,382)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:    
Net actuarial loss 667 560
Prior service cost (credit) 0 0
Accumulated other comprehensive loss $ 667 $ 560
Assumptions used to determine fiscal year-end benefit obligations:    
Discount rate 3.06% 4.15%
Assumptions used to determine net benefit costs (years ended):    
Discount rate 4.15% 3.75%
Net periodic benefit cost for the year:    
Service cost $ 0 $ 0
Interest cost 99 76
Amortization of prior service cost (credit) 0 0
Amortization of net actuarial loss 53 11
Net periodic benefit (income) cost 152 $ 87
Amounts that are estimated to be amortized from accumulated other comprehensive loss into net periodic benefit cost in the next fiscal year    
Net actuarial loss (gain) 81  
Total amount 81  
Expected Benefit Payments:    
Fiscal year ending September 30, 2020 10  
Fiscal year ending September 30, 2021 37  
Fiscal year ending September 30, 2022 32  
Fiscal year ending September 30, 2023 34  
Fiscal year ending September 30, 2024 52  
Fiscal years ending September 30, 2025 through 2029 $ 378  
Assumed health care cost trend rates related to the measurement of entity's postretirement medical obligations    
Health care cost trend rates assumed for next year 7.00% 7.25%
Ultimate cost trend rate 5.00% 5.00%
Year that the rate reaches the ultimate trend rate 2028 2028
Health care cost trend rates assumed for current fiscal year 7.25%  
Effects of one-percentage-point change in the assumed health care cost trend rates    
Effect on total service and interest cost components, increase $ 22  
Effect on accumulated postretirement benefit obligations, increase 586  
Effect on total service and interest cost components, decrease (18)  
Effect on accumulated postretirement benefit obligations, decrease $ (458)