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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  |
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Jun. 30, 2013 | Sep. 30, 2012 | Jul. 31, 2011
Debt Instrument [Line Items] |  |  |
Description of variable rate | The interest rate is LIBOR plus (i) 1.75% (if Availability, as defined in the revolving credit facility agreement is greater than or equal to $150 million), or (ii) 2.00% (if Availability is greater than $75 million but less than $150 million), or (iii) 2.25% (if Availability is less than or equal to $75 million). The Commitment Fee on the unused portion of the facility is 0.375% per annum. |  |
Condition one, additional interest rate based on LIBOR | 1.75% |  |
Condition two, additional interest rate based on LIBOR | 2.00% |  |
Condition three, additional interest rate based on LIBOR | 2.25% |  |
Minimum availability, condition one | $ 150 |  |
Maximum availability, condition two | 150 |  |
Minimum availability, condition two | 75 |  |
Maximum availability, condition three | 75 |  |
Commitment fee on the unused portion of the facility | 0.375% |  |
Availability to maintain | 43.8 |  |
Availability percentage to maximum facility size | 12.50% |  |
Minimum fixed charge coverage ratio | 1.1 |  |
Availability required to make acquisition | 40 |  |
Availability required to pay distributions | 61.3 |  |
Percentage of the maximum facility size on a historical proforma and forward-looking basis | 17.50% |  |
Maximum credit facility size on a historical proforma and forward-looking basis | 350 |  |
Seasonal advance amount included in maximum borrowing capacity under revolving credit facility | 100 |  |
Minimum fixed charge coverage ratio for distributions to unit holders | 1.15 |  |
Letters of credit issued | 45.0 | 42.8 |
Availability in compliance with the fixed charge coverage ratio | 139.1 | 179.2 |
Available sale of offering of common units under shelf registration |  |  | $ 250
8.875% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest accrued by public notes for each year | 8.875% |  |

X
- Definition Borrowing base less amounts borrowed and letters of credit issued. + References No definition available. + Details
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- Definition Availability in compliance with the fixed charge coverage ratio. + References No definition available. + Details
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- Definition Availability percentage to maximum facility size. + References No definition available. + Details
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- Definition Availability required to make acquisition. + References No definition available. + Details
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- Definition Availability required to pay distributions or repurchase common units. + References No definition available. + Details
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- Definition Available sale of offerings of common units under shelf registration. + References No definition available. + Details
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- Definition Condition One, Additional Interest rate Based on Libor + References No definition available. + Details
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- Definition Condition Three, Additional Interest rate Based on Libor + References No definition available. + Details
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- Definition Condition Two, Additional Interest rate Based on Libor + References No definition available. + Details
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- Definition Maximum Availability, Condition Three + References No definition available. + Details
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- Definition Maximum Availability, Condition Two + References No definition available. + Details
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- Definition Minimum Availability, Condition One + References No definition available. + Details
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- Definition Minimum Availability, Condition Two + References No definition available. + Details
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- Definition Minimum fixed charge coverage ratio for distributions to unitholders. + References No definition available. + Details
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- Definition Minimum percentage of borrowing capacity to pay any distributions to unitholders or repurchase common units. + References No definition available. + Details
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- Definition Seasonal Advance Amount Included in Maximum Borrowing Capacity under Revolving Credit Facility + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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