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Fair Value Measurements and Derivative Instruments - Additional Information (Details)
gal in Millions, $ in Millions
6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Apr. 30, 2027
gal
Mar. 29, 2027
gal
Sep. 30, 2025
USD ($)
Aug. 28, 2023
USD ($)
Jan. 31, 2023
USD ($)
Interest Rate Contracts              
Derivative [Line Items]              
Notional amount   $ 600.0     $ 600.0    
Interest Rate Swaps              
Derivative [Line Items]              
Notional amount             $ 500.0
Net deferred gain on interest rate swap net of taxes expected to be recognized over the next 12 months   $ 2.2          
Interest Rate Collar Agreement              
Derivative [Line Items]              
Notional amount             $ 500.0
Terminated notional amount           $ 400.0  
Fuel Swap Contracts              
Derivative [Line Items]              
Net deferred gain on fuel rate swap net of taxes expected to be recognized over the next 12 months $ 0.6            
Forecast | Fuel Contracts [Member]              
Derivative [Line Items]              
Notional volume | gal     2.0 3.0      
Maximum              
Derivative [Line Items]              
Percentage of participants compensation deferred   70.00%