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Common Unit Repurchase Plans and Retirement - Additional Information (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  |
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Sep. 30, 2013 | Jun. 30, 2013 | Sep. 30, 2010 Plan I Common Units Repurchase Program | Sep. 30, 2012 Plan II Common Units Repurchase Program | Jul. 31, 2012 Initial Common Units Authorized Plan III Common Units Repurchase Program | Jul. 31, 2013 Additional Common Units Authorized Plan III Common Units Repurchase Program
Capital Unit [Line Items] |  |  |  |  |  |  |
Average Price Paid per Unit |  |  |  | $ 4.04 | $ 4.94 |  |
Partnership's common units authorized for repurchase |  |  |  | 7,500 | 7,250 | 3,000 | 1,900
Partnership's common units authorized for repurchase in a private transaction | 1,150 | [1] | 1,150 |  |  |  |
Availability required to repurchase common units | $ 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] | Third quarter fiscal 2013 common unit repurchases include 1.15 million common units acquired in a private transaction.

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