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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
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Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of (Gain) or Loss Unrealized, commodity contracts | [1] | $ 19,030 | $ 17,636
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] | $ 4,723 | $ (8,942)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | 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] | $ 14 | $ 40
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | 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] | $ (392) | $ (200)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | 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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