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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 1 Months Ended
Jun. 30, 2013
Jul. 31, 2012
Jul. 31, 2013
Dividend Declared
Aug. 31, 2013
Subsequent Event
Jul. 31, 2013
Subsequent Event
Subsequent Event [Line Items]          
Distribution declared     $ 0.0825    
Partners capital projected distribution amount on annualized basis     $ 0.33    
Minimum dividend distribution per unit     $ 0.0675    
Percentage of distributions to common unit holders in excess of minimum quarterly distribution     90.00%    
Percentage of distributions to general unit holders in excess of minimum quarterly distribution     10.00%    
Amount to paid to common unit holders     $ 4.8    
Amount to paid to the General Partner     0.1    
Incentive distribution to the General Partner     0.05    
Incentive distributions to Management     0.05    
Dividend record date     Aug. 05, 2013    
Dividend payable date     Aug. 13, 2013    
Additional number of shares authorized to be repurchased         1,900,000
Partnership's common units authorized for repurchase   3,000,000     3,000,000
Aggregate purchase price partnership acquired 0.6     0.7  
Working capital credit $ 0.1     $ 0.1