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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 |

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