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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
Dec. 31, 2024
Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of (Gain) or Loss Unrealized, commodity contracts [1] $ (5,258) $ 19,030
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] $ 6,891 $ 4,723
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] $ 87 $ 14
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] $ 411 $ (392)
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.