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Common Unit Repurchase and Retirement - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended
Jun. 30, 2013
Jul. 31, 2012
Jul. 31, 2013
Subsequent Event
Capital Unit [Line Items]      
Partnership's common units authorized for repurchase   3,000,000 3,000,000
Partnership's common units authorized for repurchase in a private transaction   1,150,000 [1]  
Additional number of shares authorized to be repurchased     1,900,000
Availability required to pay distributions $ 61.3    
Percentage of the maximum facility size on a historical proforma and forward-looking basis 17.50%    
Maximum borrowing capacity under revolving credit facility 350    
Seasonal advance amount included in maximum borrowing capacity under revolving credit facility $ 100    
Minimum fixed charge coverage ratio to repurchase common units 1.15    
[1] June 2013 common unit repurchases include 1.15 million common units acquired in a private transaction.