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Derivatives and Hedging-Disclosures and Fair Value Measurements - Effect of Derivative Instruments on Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of (Gain) or Loss Unrealized, commodity contracts | [1] | $ (6,101) | $ (11,752) | $ (11,359) | $ 7,278
Fair Value, Measurements, Recurring | Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 | Commodity Contract | Cost of product |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of (Gain) or Loss Recognized, commodity contracts | [2] | $ 6,863 | $ 13,386 | $ 13,754 | $ 18,109
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Cost and expenses | Cost and expenses | Cost and expenses | Cost and expenses
Fair Value, Measurements, Recurring | Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 | Commodity Contract | Cost of installations and service |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of (Gain) or Loss Recognized, commodity contracts | [2] | $ 44 | $ (55) | $ 131 | $ (41)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Cost and expenses | Cost and expenses | Cost and expenses | Cost and expenses
Fair Value, Measurements, Recurring | Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 | Commodity Contract | Delivery and branch expenses |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of (Gain) or Loss Recognized, commodity contracts | [2] | $ 245 | $ (517) | $ 656 | $ (909)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Delivery and branch expenses | Delivery and branch expenses | Delivery and branch expenses | Delivery and branch expenses
[1] | Represents the change in value of unrealized open positions and expired options.
[2] | Represents realized closed positions and includes the cost of options as they expire.

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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