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Partnership's Repurchase Activities (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Aug. 31, 2013 | Jul. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership's common units authorized for repurchase in a private transaction | 1,150 | [1] |  |  |  |  | 1,150 | [1] | 1,150 |  |  |  |  |  | 1,150 | [1] |  |
Maximum Number of Units that May Yet Be Purchased Under the Program Plan III and Private Transaction Beginning Total | 6,044 |  |  |  |  |  | 6,044 |  |  |  |  |  |  |  | 6,044 |  |  |
Plan III Common Units Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan III partnership's common units authorized for repurchase | 4,894 |  |  |  |  |  | 4,894 |  |  |  |  |  |  |  | 4,894 |  |  |
Total Number of Units Purchased as Part of a Publicly Announced Plan or Program | 142 |  | 120 |  |  |  | 262 |  | 1,697 | [1] | 310 |  | 1,015 |  | 3,284 |  | 22 |
Average Price Paid per Unit | $ 4.84 | [2] | $ 4.87 | [2] |  | [2] | $ 4.85 | [2] | $ 4.92 | [1],[2] | $ 4.36 | [2] | $ 4.18 | [2] | $ 4.63 | [2] | $ 4.26 | [2]
Maximum Number of Units that May Yet Be Purchased Under the Program | 2,738 |  | 2,880 |  | 3,000 |  | 2,738 |  | 3,000 | [1] | 4,697 |  | 5,007 |  | 2,738 |  | 6,022 |
[1] | Third quarter fiscal 2013 common unit repurchases include 1.15 million common units acquired in a private transaction.
[2] | Amounts include repurchase costs.

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