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RETIREMENT PLANS (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Change in Plan Assets:    
Fair value of plan assets at beginning of year $ 8,195  
Fair value of plan assets at end of year 9,098 $ 8,195
Amounts recognized in the Consolidated Balance Sheets:    
Noncurrent liabilities $ (4,150) (6,707)
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 $ 10,055 8,683
Service cost 237 261
Interest cost 336 364
Actuarial (gain) loss (740) 953
Benefits paid (255) (206)
Benefit obligation at end of year 9,633 10,055
Change in Plan Assets:    
Fair value of plan assets at beginning of year 8,195 6,488
Actual return on plan assets 808 813
Employer contributions 350 1,100
Benefits paid (255) (206)
Fair value of plan assets at end of year 9,098 8,195
Funded status (535) (1,860)
Amounts recognized in the Consolidated Balance Sheets:    
Noncurrent liabilities (535) (1,860)
Net amount (535) (1,860)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:    
Net actuarial loss (gain) 2,374 3,521
Prior service cost (credit) 65 70
Accumulated other comprehensive loss (income) 2,439 $ 3,591
Other disclosures    
Expected contributions $ 500  
Assumptions used to determine fiscal year-end benefit obligations:    
Discount rate 3.75% 3.50%
Rate of compensation increase 4.00% 4.00%
Assumptions used to determine net benefit costs (years ended):    
Discount rate 3.50% 4.25%
Expected return on plan assets 6.50% 7.00%
Rate of compensation increase 4.00% 4.00%
Net periodic benefit cost for the year:    
Service cost $ 237 $ 261
Interest cost 336 364
Expected return on plan assets (539) (484)
Amortization of prior service cost (credit) 6 5
Amortization of net actuarial loss 138 141
Net periodic benefit cost 178 287
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) 6  
Net actuarial loss (gain) 86  
Total amount 92  
Accumulated benefit obligation 8,530 8,566
Expected Benefit Payments:    
Fiscal year ending September 30, 2018 301  
Fiscal year ending September 30, 2019 284  
Fiscal year ending September 30, 2020 386  
Fiscal year ending September 30, 2021 404  
Fiscal year ending September 30, 2022 390  
Fiscal years ending September 30, 2023 through 2027 2,521  
SERP    
Change in Projected Benefit Obligation:    
Benefit obligation at beginning of year 2,366 1,900
Service cost 34 68
Interest cost 56 86
Actuarial (gain) loss (847) 318
Benefits paid (4) (6)
Benefit obligation at end of year 1,605 2,366
Change in Plan Assets:    
Employer contributions 4 6
Benefits paid (4) (6)
Funded status (1,605) (2,366)
Amounts recognized in the Consolidated Balance Sheets:    
Current liabilities (4) (5)
Noncurrent liabilities (1,601) (2,361)
Net amount (1,605) (2,366)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:    
Net actuarial loss (gain) (50) 797
Prior service cost (credit) (65) (70)
Accumulated other comprehensive loss (income) $ (115) $ 727
Assumptions used to determine fiscal year-end benefit obligations:    
Discount rate 3.75% 3.50%
Rate of compensation increase 4.00% 4.00%
Assumptions used to determine net benefit costs (years ended):    
Discount rate 3.50% 4.25%
Rate of compensation increase 4.00% 4.00%
Net periodic benefit cost for the year:    
Service cost $ 34 $ 68
Interest cost 56 86
Amortization of prior service cost (credit) (6) (5)
Amortization of net actuarial loss 0 27
Net periodic benefit cost 84 176
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) 0  
Total amount (5)  
Accumulated benefit obligation 1,510 1,822
Expected Benefit Payments:    
Fiscal year ending September 30, 2018 4  
Fiscal year ending September 30, 2019 4  
Fiscal year ending September 30, 2020 58  
Fiscal year ending September 30, 2021 59  
Fiscal year ending September 30, 2022 58  
Fiscal years ending September 30, 2023 through 2027 $ 531  
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 $ 2,486 1,319
Service cost 0 0
Interest cost 87 56
Actuarial (gain) loss (533) 1,111
Benefits paid (11) 0
Benefit obligation at end of year 2,029 2,486
Change in Plan Assets:    
Employer contributions 11  
Benefits paid (11)  
Funded status (2,029) (2,486)
Amounts recognized in the Consolidated Balance Sheets:    
Current liabilities (15) 0
Noncurrent liabilities (2,014) (2,486)
Net amount (2,029) (2,486)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:    
Net actuarial loss (gain) 280 1,001
Prior service cost (credit) 0 0
Accumulated other comprehensive loss (income) $ 280 $ 1,001
Assumptions used to determine fiscal year-end benefit obligations:    
Discount rate 3.75% 3.50%
Assumptions used to determine net benefit costs (years ended):    
Discount rate 3.50% 4.25%
Net periodic benefit cost for the year:    
Service cost $ 0 $ 0
Interest cost 87 56
Amortization of prior service cost (credit) 0 0
Amortization of net actuarial loss 188 0
Net periodic benefit cost 275 $ 56
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) 11  
Total amount 11  
Expected Benefit Payments:    
Fiscal year ending September 30, 2018 15  
Fiscal year ending September 30, 2019 15  
Fiscal year ending September 30, 2020 15  
Fiscal year ending September 30, 2021 42  
Fiscal year ending September 30, 2022 44  
Fiscal years ending September 30, 2023 through 2027 $ 315  
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 7.50% 7.80%
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 7.80%  
Effects of one-percentage-point change in the assumed health care cost trend rates    
Effect on total service and interest cost components, increase $ 18  
Effect on accumulated postretirement benefit obligations, increase 464  
Effect on total service and interest cost components, decrease (15)  
Effect on accumulated postretirement benefit obligations, decrease $ (361)