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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 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Gain) or Loss Unrealized, commodity contracts [1] $ (1,036) $ (7,669) $ 19,622 $ (11,881)
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] $ 5,566 $ (8,648) $ 10,578 $ (27,168)
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] $ (24) $ (142) $ 55 $ (1,624)
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] $ 273 $ (138) $ 422 $ (3,390)
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.