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Derivatives and Hedging-Disclosures and Fair Value Measurements - Additional Information (Detail) gal in Millions	12 Months Ended
	Sep. 30, 2022 USD ($) gal	Sep. 30, 2021 USD ($) gal
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedging positions and payable amounts secured under credit facility	$ 0
Prepaid expense and other current assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregated cash posted as collateral in normal course of business	1,300,000
Interest rate swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	54,000,000.0	$ 59,000,000.0
Fair Value	$ 2,000,000.0	$ (1,600,000)
Percentage of market risk exposure of long term debt	33.00%
Call Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	36.3	7.8
Notional Value	$ 101,400,000	$ 18,900,000
Fair Value	$ 19,200,000	$ 1,200,000
Call Option | Synthetic calls
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	38.6	74.2
Notional Value	$ 126,700,000	$ 143,200,000
Fair Value	$ (1,800,000)	$ 23,700,000
Put Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	3.2	4.4
Notional Value	$ 7,600,000	$ 5,800,000
Fair Value	$ 500,000	$ 100,000
Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	7.5	11.8
Notional Value	$ 20,600,000	$ 22,900,000
Fair Value	$ (300,000)	$ 1,400
Future Contracts | Short
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	6.7	21.0
Notional Value	$ 22,100,000	$ 42,100,000
Fair Value	$ 1,000,000.0	$ (6,800,000)
Future Contracts | Long
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal		3.8
Notional Value		$ 5,400,000
Fair Value		$ 3,400,000
Hedge its Internal Fuel Usage and Other Related Activities Call Options and Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	5.2	6.8
Notional Value	$ 15,100,000	$ 13,800,000
Fair Value	$ (1,100,000)	$ 1,500,000
Swap Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	14.7
Notional Value	$ 55,200,000
Fair Value	$ 2,000,000.0

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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