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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
EMPLOYEE BENEFIT PLANS      
Accumulated Benefit Obligation $ 107,417 $ 111,108  
Changes in projected benefit obligations      
Projected benefit obligation at beginning of year 111,108 102,680  
Interest cost 4,584 4,763 $ 4,339
Actuarial loss 2,741 10,787  
Benefits paid (11,016) (7,122)  
Projected benefit obligation at end of year 107,417 111,108 102,680
Change in plan assets      
Fair value of plan assets at beginning of year 108,157 96,818  
Actual return on plan assets (1,324) 11,132  
Employer contribution 2,243 7,329  
Benefits paid (11,016) (7,122)  
Fair value of plan assets at end of year 98,060 108,157 $ 96,818
Funded status of the plan at end of year (9,357) (2,951)  
Amounts Recognized in the Consolidated Balance Sheets      
Accrued liabilities (44) (62)  
Noncurrent liabilities-other (9,313) (2,889)  
Net amount recognized (9,357) (2,951)  
Amounts recognized in accumulated other comprehensive income and not yet reflected in net periodic benefit cost      
Net actuarial loss (30,144) $ (23,405)  
Net actuarial loss, which is expected to be amortized in next year's periodic benefit cost $ 2,000    
Weighted average assumptions used for the pension calculations      
Discount rate for net periodic benefit costs (as a percent) 4.32% 4.80% 4.06%
Discount rate for year-end obligations (as a percent) 4.27% 4.32% 4.80%
Expected return on plan assets (as a percent) 6.26% 6.61% 7.06%
Components of the net periodic pension expense (benefit)      
Interest cost $ 4,584 $ 4,763 $ 4,339
Expected return on plan assets (6,855) (6,789) (6,099)
Amortization of prior service cost     1
Recognized net actuarial loss 1,308 873 2,372
Pension settlement charges 2,873 1,376  
Net pension expense (benefit) 1,910 $ 223 $ 613
Expected benefits to be paid from the Pension Plan      
2016 5,855    
2017 5,547    
2018 6,441    
2019 6,560    
2020 7,879    
2021-2025 33,540    
Total $ 65,822    
Target Allocation (as a percent) 100.00%    
Percentage of Plan Assets 100.00% 100.00%  
U.S. equities      
Expected benefits to be paid from the Pension Plan      
Target Allocation (as a percent) 55.00%    
Percentage of Plan Assets 59.00% 61.00%  
International equities      
Expected benefits to be paid from the Pension Plan      
Target Allocation (as a percent) 13.00%    
Percentage of Plan Assets 13.00% 12.00%  
Fixed income      
Expected benefits to be paid from the Pension Plan      
Target Allocation (as a percent) 27.00%    
Percentage of Plan Assets 23.00% 25.00%  
Real estate and other      
Expected benefits to be paid from the Pension Plan      
Target Allocation (as a percent) 5.00%    
Percentage of Plan Assets 5.00% 2.00%