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Derivatives and Hedging-Disclosures and Fair Value Measurements - Additional Information (Detail) $ in Thousands, gal in Millions	12 Months Ended
	Sep. 30, 2015 USD ($) gal	Sep. 30, 2014 USD ($) gal
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	12.3
Notional Value	$ 18,300
Fair Value	(500)
Aggregated cash posted as collateral in normal course of business	2,800
Hedging positions and payable amounts secured under credit facility	$ 15,300	$ 14,900
Call Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	7.2	3.1
Notional Value	$ 17,100	$ 10,800
Fair Value	$ 100	$ 10
Put Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	5.5	8.5
Notional Value	$ 6,500	$ 19,300
Fair Value	$ 200	$ 100
Synthetic calls | Call Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	94.6	83.8
Notional Value	$ 183,900	$ 252,300
Fair Value	$ (12,000)	$ (28,800)
Inventory
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	6.8	13.9
Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	$ 12,700	$ 39,900
Fair Value	$ (1,900)	$ (2,900)
Swap Contracts Sold
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	1.8	18.7
Notional Value	$ 3,400	$ 52,000
Fair Value	$ (500)	$ 2,300
Corresponding Long And Short Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	8.9	12.4
Notional Value	$ 17,200	$ 36,200
Fair Value	$ (2,000)	$ (200)
Swap Contract Sold
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	32.0
Notional Value	$ 54,100
Fair Value	$ 2,900
Hedge its Internal Fuel Usage Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	6.0	4.3
Notional Value	$ 11,100	$ 12,000
Fair Value	$ (1,900)	$ (900)

X

- 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

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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

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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

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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 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
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-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 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal volume used to calculate payments on a derivative instrument.

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