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Derivatives and Hedging-Disclosures and Fair Value Measurements - Effect of Derivative Instruments on Statement of Operations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (Gain) or Loss Unrealized, commodity contracts [1] $ 19,018 $ 1,977 $ 17,286
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] $ 20,268 $ 17,268 $ (34,523)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Goods and Services Sold Cost of Goods and Services Sold Cost of Goods and Services Sold
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] $ (184) $ 16 $ (1,555)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Goods and Services Sold Cost of Goods and Services Sold Cost of Goods and Services Sold
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] $ (865) $ 434 $ (3,423)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Operating Costs and Expenses Operating Costs and Expenses Operating Costs and 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.