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Derivatives and Hedging-Disclosures and Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Jun. 30, 2013 gal | Jun. 30, 2012 gal
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Aggregated cash posted as collateral in normal course of business | $ 0.9 |
Hedging positions secured under credit facility | $ 8.0 |
Call Option |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 1,300,000 | 1,400,000
Put Option |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 3,100,000 | 4,100,000
Inventory |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 1,000,000 | 1,200,000
Swap Contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 4,300,000 | 4,800,000
Synthetic calls |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 47,100,000 | 44,600,000
Futures Contracts Bought |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 27,300,000 | 47,000,000
Futures Contracts Sold |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 34,000,000 | 51,500,000
Swap Contracts Sold |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 4,400,000 |
Hedge a Majority of its Internal Fuel Usage |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative activity volume | 2,000,000 | 2,600,000

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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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- Details
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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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