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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Mar. 31, 2013
Sep. 30, 2012
Jul. 31, 2011
Mar. 31, 2013
8.875% Senior Notes
Mar. 31, 2013
First Amendment
Debt [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%
Minimum fixed charge coverage ratio for distributions to unit holders         1.15
Interest accrued by public notes for each year       8.875%  
Amount outstanding under the revolving credit facility 61.0        
Letters of credit issued 45.0 42.8      
Availability in compliance with the fixed charge coverage ratio 137.0 179.2      
Available sale of offering of common units under shelf registration     $ 250