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EMPLOYEE BENEFIT PLANS (Details) (USD $)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
EMPLOYEE BENEFIT PLANS    
Accumulated Benefit Obligation $ 104,911,000$ 102,097,000 
Changes in projected benefit obligations    
Projected benefit obligation at beginning of year104,911,000102,097,00089,996,000 
Interest cost 4,519,0004,825,0004,988,000
Actuarial gain 2,411,00011,482,000 
Benefits paid (4,116,000)(4,206,000) 
Projected benefit obligation at end of year 104,911,000102,097,00089,996,000
Change in plan assets    
Fair value of plan assets at beginning of year67,284,00061,388,00057,181,000 
Actual return on plan assets (1,323,000)5,005,000 
Employer contribution 11,335,0003,408,000 
Benefits paid (4,116,000)(4,206,000) 
Fair value of plan assets at end of year 67,284,00061,388,00057,181,000
Funded status of the plan at end of year (37,627,000)(40,709,000) 
Amounts Recognized in the Consolidated Balance Sheets    
Accrued liabilities (68,000)(181,000) 
Noncurrent liabilities-other (37,559,000)(40,528,000) 
Net amount recognized (37,627,000)(40,709,000) 
Amounts recognized in accumulated other comprehensive income and not yet reflected in net periodic benefit cost    
Net actuarial gain (loss) (43,781,000)(38,001,000) 
Prior service cost (2,000)(2,000) 
Total (43,783,000)(38,003,000) 
Net actuarial loss, which is expected to be amortized in next year's periodic benefit cost 3,500,000  
Weighted average assumptions used for the pension calculations    
Discount rate for net periodic benefit costs (as a percent) 4.48%5.42%7.25%
Discount rate for year-end obligations (as a percent) 4.33%4.48%5.42%
Expected return on plan assets (as a percent) 8.00%8.00%8.00%
Estimated contribution by the employer in next fiscal year to Pension Plan 800,000  
Components of the net periodic pension expense (benefit)    
Interest cost 4,519,0004,825,0004,988,000
Expected return on plan assets (5,050,000)(4,552,000)(4,643,000)
Amortization of prior service cost   (1,000)
Recognized net actuarial loss 2,976,0002,295,0003,000
Settlement/curtailment 28,000  
Net pension expense (benefit) 2,473,0002,568,000347,000
Expected benefits to be paid from the Pension Plan    
2012 6,171,000  
2013 5,626,000  
2014 5,278,000  
2015 5,965,000  
2016 6,678,000  
2017-2021 35,649,000  
Total $ 65,367,000  
Asset Category, Target Allocation    
U.S. equities, Target Allocation (as a percent)56.00%   
International equities, Target Allocation (as a percent)14.00%   
Fixed income, Target Allocation (as a percent)25.00%   
Real estate and other, Target Allocation (as a percent)5.00%   
Total target allocation (as a percent)100.00%   
Asset Category, Percentage of Plan Assets    
U.S. equities, Percentage of Plan Assets 56.00%53.00% 
International equities, Percentage of Plan Assets 13.00%15.00% 
Fixed income, Percentage of Plan Assets 30.00%31.00% 
Real estate and other, Percentage of Plan Assets 1.00%1.00% 
Total percentage of plan assets 100.00%100.00%