v3.26.1
Fair Value Measurements and Derivative Instruments - Additional Information (Details)
gal in Millions, $ in Millions
6 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Apr. 30, 2027
gal
Mar. 29, 2027
gal
Apr. 27, 2026
gal
Sep. 30, 2025
USD ($)
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 1.1            
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 $ 1.2            
Subsequent Event | Fuel Contracts [Member]              
Derivative [Line Items]              
Notional volume | gal       2.0      
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%