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Fair Value Measurements and Derivative Instruments - Additional Information (Details)
gal in Millions, $ in Millions
6 Months Ended 9 Months Ended
Apr. 30, 2025
gal
Mar. 31, 2025
gal
Jun. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Aug. 28, 2023
USD ($)
Jan. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Interest Rate Contracts              
Derivative [Line Items]              
Notional amount     $ 600.0 $ 600.0      
Interest Rate Swaps              
Derivative [Line Items]              
Notional amount           $ 500.0 $ 500.0
Net deferred gain on interest rate swap net of taxes expected to be recognized over the next 12 months     $ 1.7        
Interest Rate Collar Agreement              
Derivative [Line Items]              
Notional amount           $ 500.0  
Terminated notional amount         $ 400.0    
Fuel Contracts              
Derivative [Line Items]              
Notional volume | gal 5.5 2.5          
Maximum              
Derivative [Line Items]              
Percentage of participants compensation deferred     70.00%