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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Jul. 31, 2011
Debt Instrument [Line Items]      
Description of variable rate The interest rate is LIBOR plus (i) 1.75% (if Availability, as defined in the revolving credit facility agreement is greater than or equal to $150 million), or (ii) 2.00% (if Availability is greater than $75 million but less than $150 million), or (iii) 2.25% (if Availability is less than or equal to $75 million). The Commitment Fee on the unused portion of the facility is 0.375% per annum    
Condition one, additional interest rate based on LIBOR 1.75%    
Condition two, additional interest rate based on LIBOR 2.00%    
Condition three, additional interest rate based on LIBOR 2.25%    
Minimum availability, condition one $ 150    
Maximum availability, condition two 150    
Minimum availability, condition two 75    
Maximum availability, condition three 75    
Commitment fee on the unused portion of the facility 0.375%    
Availability to maintain 43.8    
Availability percentage to maximum facility size 12.50%    
Minimum fixed charge coverage ratio 1.1    
Availability required to make acquisition 40    
Availability required to pay distributions 61.3    
Percentage of the maximum facility size on a historical proforma and forward-looking basis 17.50%    
Maximum credit facility size on a historical proforma and forward-looking basis 350    
Seasonal advance amount included in maximum borrowing capacity under revolving credit facility 100    
Minimum fixed charge coverage ratio for distributions to unit holders 1.15    
Letters of credit issued 44.7 42.8  
Availability in compliance with the fixed charge coverage ratio 164.3 179.2  
Total restricted net asset 375 378  
Available sale of offering of common units under shelf registration     250
Revolving Credit Facility
      
Debt Instrument [Line Items]      
Revolving credit facility outstanding $ 0 $ 0  
8.875% Senior Notes
      
Debt Instrument [Line Items]      
Interest accrued by public notes for each year 8.875%