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Employee Benefit Plans (Details Textual) (USD $)
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Employee Benefit Plans (Textual) [Abstract]      
Maximum participant contribution 60.00%    
Maximum core contribution of participants 5.50%    
Minimum Service Period for Defined Benefit Plans 10 years    
Minimum age for defined benefit plan 55 years    
Defined contribution plan matching percentage by employer 2.00%    
Partnership aggregate contribution to 401(k) plans $ 4,500,000 $ 4,700,000 $ 4,400,000
Maximum funded for red zone 65.00%    
Maximum funded for yellow zone 80.00%    
Minimum funded for green zone 80.00%    
Partnership contributions in excess of 5% of the plan's total contributions in percentage 5.00%    
Defined benefit plan funded status included in other long-term liabilities 12,700,000 15,400,000  
Net actuarial loss balance in accumulated other comprehensive income to be amortized 31,900,000    
Amount to be amortized from accumulated other comprehensive income 2,700,000    
Rate pension plan assets expect to earn 7.00%    
Discount rate to determine periodic pension expense 4.35% 4.70% 5.40%
Pension asset allocation for domestic fixed income 60.00%    
Pension asset allocation for international equities 10.00%    
Pension asset allocation for domestic equities 30.00%    
Pension Contribution 3,600,000    
Expected benefit payments in years 5 years    
Expected benefit payments over the next 5 years 4,400,000    
Aggregate expected benefit payment 21,300,000    
Management [Member]
      
Employee Benefit Plans (Textual) [Abstract]      
Incentive distribution percentage of available cash in excess of minimum quarterly distribution 50.00%    
Minimum quarterly distribution 0.0675    
Gains interest cash proceeds percentage from the sale of general partner units 50.00%    
Partnership incentive distribution 277,000 261,000 116,000
Executive Officer [Member]
      
Employee Benefit Plans (Textual) [Abstract]      
Partnership incentive distribution $ 99,000 $ 92,000 $ 40,000
Minimum [Member]
      
Employee Benefit Plans (Textual) [Abstract]      
Participant Contribution 0.00%    
Percentage of core contribution of participants 4.00%