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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.

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