v3.26.1
Long-Term Debt - Credit Agreement (Details)
$ in Millions
9 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
Debt Instrument      
Debt Covenant, Leverage Ratio 4.25    
Revolving Credit Facility      
Debt Instrument      
Line of Credit Facility, Current Borrowing Capacity $ 1,000.0    
Proceeds from Lines of Credit 365.0 $ 400.0  
Repayments of Lines of Credit 805.0    
Long-term Debt 0.0   $ 440.0
Letters of Credit Outstanding, Amount 23.2   22.3
Line of Credit Facility, Remaining Borrowing Capacity 976.8   $ 537.7
Line of Credit Facility, Interest Rate at Period End     5.83%
Debt Covenant, Maximum Undischarged Judgments $ 125.0    
Revolving Credit Facility | High-End Ratio      
Debt Instrument      
Debt Covenant, Leverage Ratio 3.00    
Revolving Credit Facility | Low-End Ratio      
Debt Instrument      
Debt Covenant, Leverage Ratio 1.50    
Revolving Credit Facility | Maximum      
Debt Instrument      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.375%    
Revolving Credit Facility | Minimum      
Debt Instrument      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%    
Revolving Credit Facility | NYFRB      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Revolving Credit Facility | One-Month adjusted term SOFR      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Revolving Credit Facility | Base Rate | Maximum      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Revolving Credit Facility | Base Rate | Median      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 0.75%    
Revolving Credit Facility | Base Rate | Minimum      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Revolving Credit Facility | Adjusted term SOFR | Maximum      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 2.00%    
Revolving Credit Facility | Adjusted term SOFR | Median      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 1.75%    
Revolving Credit Facility | Adjusted term SOFR | Minimum      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 1.50%    
Letter of Credit      
Debt Instrument      
Line of Credit Facility, Current Borrowing Capacity $ 75.0