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Inventories - Additional Information (Detail) | 12 Months Ended
--- | ---
Sep. 30, 2013 gal | Sep. 30, 2012 gal
Inventory [Line Items] |  |
Heating oil and other fuel inventories | 17,100,000 | 10,000,000
Market price based product supply contracts for next twelve months | 221,000,000 |
Maximum product supply by other supplier | 10.00% | 10.00%
Global Companies LLC |  |
Inventory [Line Items] |  |
Product purchases | 19.00% |
JPMorgan Ventures Energy Corporation |  |
Inventory [Line Items] |  |
Product purchases | 11.00% |
NIC Holding Corp |  |
Inventory [Line Items] |  |
Product purchases | 9.00% |
Phillips 66 |  |
Inventory [Line Items] |  |
Product purchases | 9.00% |
Global Companies LLC |  |
Inventory [Line Items] |  |
Product purchases |  | 24.00%
J P Morgan Ventures Energy Corp |  |
Inventory [Line Items] |  |
Product purchases |  | 9.00%
Nic Holding Corp |  |
Inventory [Line Items] |  |
Product purchases |  | 9.00%

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- Definition Heating Oil And Other Fuel Inventories + References No definition available. + Details
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- Definition Market Price Based Product Supply Contracts + References No definition available. + Details
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- Definition Maximum Percentage Of Product Purchases + References No definition available. + Details
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- Definition Percentage Of Product Purchases + References No definition available. + Details
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- Details
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