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Derivatives and Hedging-Disclosures and Fair Value Measurements - Additional Information (Detail) (USD $) | 12 Months Ended
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Sep. 30, 2014 gal | Sep. 30, 2013 gal
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Aggregated cash posted as collateral in normal course of business | $ 2,500,000 |
Hedging positions and payable amounts secured under credit facility | 14,900,000 | 10,500,000
Call Option |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 3,100,000 | 2,900,000
Notional Value | 10,800,000 | 10,600,000
Fair Value | 10,000 | 20,000
Put Option |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 8,500,000 | 5,000,000
Notional Value | 19,300,000 | 11,800,000
Fair Value | 100,000 | 40,000
Inventory |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 13,900,000 | 2,400,000
Swap Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume |  | 6,000,000
Notional Value | 39,900,000 | 18,000,000
Fair Value | (2,900,000) | (200,000)
Synthetic calls |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 83,800,000 | 81,200,000
Notional Value | 252,300,000 | 252,800,000
Fair Value | (28,800,000) | (15,900,000)
Futures Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume |  | 17,400,000
Notional Value |  | 51,900,000
Fair Value |  | (600,000)
Futures Contracts Sold |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume |  | 26,400,000
Notional Value |  | 78,900,000
Fair Value |  | 1,200,000
Swap Contracts Sold |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 18,700,000 | 8,500,000
Notional Value | 52,000,000 | 24,900,000
Fair Value | 2,300,000 | (300,000)
Corresponding Long And Short Swap Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 12,400,000 | 28,200,000
Notional Value | 36,200,000 | 83,800,000
Fair Value | (200,000) | 700,000
Hedge a Majority of its Internal Fuel Usage Swap Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 4,300,000 | 3,200,000
Notional Value | 12,000,000 | 9,000,000
Fair Value | (900,000) | 50,000
Spread Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume |  | 6,000,000
Notional Value |  | (500,000)
Fair Value |  | $ 100,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),2) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 7 + Details
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- Definition Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Details
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