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RETIREMENT PLANS (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Change in Plan Assets:    
Fair value of plan assets at beginning of year $ 9,098  
Fair value of plan assets at end of year 10,012 $ 9,098
Amounts recognized in the Consolidated Balance Sheets:    
Noncurrent assets 848 0
Noncurrent liabilities $ (4,410) (4,150)
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 $ 9,633 10,055
Service cost 216 237
Interest cost 355 336
Actuarial (gain) loss (576) (740)
Benefits paid (464) (255)
Benefit obligation at end of year 9,164 9,633
Change in Plan Assets:    
Fair value of plan assets at beginning of year 9,098 8,195
Actual return on plan assets 1,178 808
Employer contributions 200 350
Benefits paid (464) (255)
Fair value of plan assets at end of year 10,012 9,098
Funded status 848 (535)
Amounts recognized in the Consolidated Balance Sheets:    
Noncurrent assets 848 0
Noncurrent liabilities 0 (535)
Net amount 848 (535)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:    
Net actuarial loss (gain) 1,112 2,374
Prior service cost (credit) 59 65
Accumulated other comprehensive loss (income) 1,171 $ 2,439
Other disclosures    
Expected contributions $ 100  
Assumptions used to determine fiscal year-end benefit obligations:    
Discount rate 4.15% 3.75%
Rate of compensation increase 4.00% 4.00%
Assumptions used to determine net benefit costs (years ended):    
Discount rate 3.75% 3.50%
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 $ 216 $ 237
Interest cost 355 336
Expected return on plan assets (591) (539)
Amortization of prior service cost (credit) 6 6
Amortization of net actuarial loss 99 138
Net periodic benefit cost 85 178
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) 8  
Total amount 13  
Accumulated benefit obligation 8,122 8,530
Expected Benefit Payments:    
Fiscal year ending September 30, 2019 294  
Fiscal year ending September 30, 2020 393  
Fiscal year ending September 30, 2021 410  
Fiscal year ending September 30, 2022 394  
Fiscal year ending September 30, 2023 528  
Fiscal years ending September 30, 2024 through 2028 2,603  
SERP    
Change in Projected Benefit Obligation:    
Benefit obligation at beginning of year 1,605 2,366
Service cost 39 34
Interest cost 76 56
Actuarial (gain) loss 323 (847)
Benefits paid (4) (4)
Benefit obligation at end of year 2,039 1,605
Change in Plan Assets:    
Employer contributions 4 4
Benefits paid (4) (4)
Funded status (2,039) (1,605)
Amounts recognized in the Consolidated Balance Sheets:    
Current liabilities (4) (4)
Noncurrent liabilities (2,035) (1,601)
Net amount (2,039) (1,605)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:    
Net actuarial loss (gain) 260 (50)
Prior service cost (credit) (59) (65)
Accumulated other comprehensive loss (income) $ 201 $ (115)
Assumptions used to determine fiscal year-end benefit obligations:    
Discount rate 4.15% 3.75%
Rate of compensation increase 4.00% 4.00%
Assumptions used to determine net benefit costs (years ended):    
Discount rate 3.75% 3.50%
Rate of compensation increase 4.00% 4.00%
Net periodic benefit cost for the year:    
Service cost $ 39 $ 34
Interest cost 76 56
Amortization of prior service cost (credit) (6) (6)
Amortization of net actuarial loss 14 0
Net periodic benefit cost 123 84
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) 4  
Total amount (1)  
Accumulated benefit obligation 1,699 1,510
Expected Benefit Payments:    
Fiscal year ending September 30, 2019 4  
Fiscal year ending September 30, 2020 65  
Fiscal year ending September 30, 2021 66  
Fiscal year ending September 30, 2022 65  
Fiscal year ending September 30, 2023 135  
Fiscal years ending September 30, 2024 through 2028 $ 690  
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 $ 2,029 2,486
Service cost 0 0
Interest cost 76 87
Actuarial (gain) loss 290 (533)
Benefits paid (13) (11)
Benefit obligation at end of year 2,382 2,029
Change in Plan Assets:    
Employer contributions 13 11
Benefits paid (13) (11)
Funded status (2,382) (2,029)
Amounts recognized in the Consolidated Balance Sheets:    
Current liabilities (7) (15)
Noncurrent liabilities (2,375) (2,014)
Net amount (2,382) (2,029)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:    
Net actuarial loss (gain) 560 280
Prior service cost (credit) 0 0
Accumulated other comprehensive loss (income) $ 560 $ 280
Assumptions used to determine fiscal year-end benefit obligations:    
Discount rate 4.15% 3.75%
Assumptions used to determine net benefit costs (years ended):    
Discount rate 3.75% 3.50%
Net periodic benefit cost for the year:    
Service cost $ 0 $ 0
Interest cost 76 87
Amortization of prior service cost (credit) 0 0
Amortization of net actuarial loss 11 188
Net periodic benefit cost 87 $ 275
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) 54  
Total amount 54  
Expected Benefit Payments:    
Fiscal year ending September 30, 2019 7  
Fiscal year ending September 30, 2020 9  
Fiscal year ending September 30, 2021 37  
Fiscal year ending September 30, 2022 41  
Fiscal year ending September 30, 2023 34  
Fiscal years ending September 30, 2024 through 2028 $ 382  
Assumed health care cost trend rates related to the measurement of entity's postretirement medical obligations    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year 7.25% 7.50%
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 7.50%  
Effects of one-percentage-point change in the assumed health care cost trend rates    
Effect on total service and interest cost components, increase $ 17  
Effect on accumulated postretirement benefit obligations, increase 540  
Effect on total service and interest cost components, decrease (14)  
Effect on accumulated postretirement benefit obligations, decrease $ (422)