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Derivatives and Hedging-Disclosures and Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 gal | Sep. 30, 2012 gal
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Aggregated cash posted as collateral in normal course of business | $ 1.1 |
Hedging positions secured under credit facility | 10.5 |
Call Option |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 2,900,000 | 2,800,000
Notional Value | 10.6 | 10.0
Fair Value | 0.02 | 0.10
Put Option |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 5,000,000 | 6,800,000
Notional Value | 11.8 | 16.1
Fair Value | 0.04 | 0.10
Inventory |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 2,400,000 | 3,300,000
Swap Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 6,000,000 | 7,100,000
Notional Value | 18.0 | 21.1
Fair Value | (0.20) | 0.80
Synthetic calls |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 81,200,000 | 75,200,000
Notional Value | 252.8 | 237.5
Fair Value | (15.90) | 3.70
Futures Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 17,400,000 | 22,600,000
Notional Value | 51.9 | 67.6
Fair Value | (0.60) | 1.70
Futures Contracts Sold |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 26,400,000 | 26,700,000
Notional Value | 78.9 | 80.3
Fair Value | 1.20 | (1.90)
Swap Contract Sold |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 8,500,000 | 24,300,000
Notional Value | 24.9 | 75.3
Fair Value | (0.30) | (0.30)
Hedge a Majority of its Internal Fuel Usage Swap Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 3,200,000 | 2,200,000
Notional Value | 9.0 | 5.7
Fair Value | 0.05 | 0.60
Swap Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume |  | 19,200,000
Notional Value |  | 60.6
Fair Value |  | (0.40)
Corresponding Long And Short Swap Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 28,200,000 |
Notional Value | 83.8 |
Fair Value | 0.70 |
Spread Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 6,000,000 |
Notional Value | (0.5) |
Fair Value | $ 0.10 |

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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 Derivative Instruments Designated As Hedging Instruments Position Secured Under Credit Facility + References No definition available. + 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 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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