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Derivatives and Hedging-Disclosures and Fair Value Measurements - Additional Information (Detail) gal in Millions	12 Months Ended
	Sep. 30, 2024 USD ($) gal	Sep. 30, 2023 USD ($) gal
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedging positions and payable amounts secured under credit facility	$ 14,200,000	$ 100,000
Prepaid expense and other current assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregated cash posted as collateral in normal course of business	300,000
Interest rate swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	52,000,000	55,500,000
Fair Value	$ (300,000)	$ 1,600,000
Percentage of market risk exposure of long term debt	25.00%
Call Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	6.0	8.1
Notional Value	$ 18,200,000	$ 25,600,000
Fair Value		$ 1,700,000
Call Option | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair Value	$ 100,000
Call Option | Synthetic calls
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	52.1	57.3
Notional Value	$ 133,900,000	$ 164,200,000
Fair Value	$ (9,200,000)	$ 4,000,000
Put Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	7.1	4.2
Notional Value	$ 12,700,000	$ 9,300,000
Fair Value	$ 300,000	$ 100,000
Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	12.2	9.3
Notional Value	$ 29,400,000	$ 26,100,000
Fair Value	$ (2,800,000)	$ 1,900,000
Future Contracts | Short
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	6.2	10.0
Notional Value	$ 14,000,000	$ 28,200,000
Fair Value	$ 600,000	$ (3,800,000)
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	8.4	7.7
Notional Value	$ 20,300,000	$ 19,100,000
Fair Value	$ (2,300,000)	$ 2,900,000
Swap Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume | gal	0.7
Notional Value	$ 1,400,000
Swap Contracts | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair Value	$ 100,000

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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://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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+ 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/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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