v3.26.1
Borrowings - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Feb. 27, 2025
Aug. 15, 2023
May 18, 2021
Feb. 25, 2020
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Line of Credit Facility [Line Items]                  
Debt instrument, basis spread, variable rate (as a percent)             0.10%    
Credit facilities payable         $ 501,000,000   $ 501,000,000   $ 545,000,000
Interest rate swap | Designated as Hedging Instrument                  
Line of Credit Facility [Line Items]                  
Interest rate (as a percent)     2.70%            
Notional amount     $ 350,000,000.0            
Greater Than 1.60x Borrowings Base                  
Line of Credit Facility [Line Items]                  
Debt covenant ratio             1.60    
Secured Overnight Financing Rate (SOFR)                  
Line of Credit Facility [Line Items]                  
Interest rate (as a percent)             1.875%    
Debt instrument, basis spread, variable rate (as a percent)             0.10%    
Secured Overnight Financing Rate (SOFR) | Interest rate swap | Designated as Hedging Instrument                  
Line of Credit Facility [Line Items]                  
Floating interest rate (as a percent)     0.26161%            
Secured Overnight Financing Rate (SOFR) | Greater Than 1.60x Borrowings Base                  
Line of Credit Facility [Line Items]                  
Interest rate (as a percent)             1.75%    
Debt instrument, basis spread, variable rate (as a percent)             0.10%    
Base Rate                  
Line of Credit Facility [Line Items]                  
Interest rate (as a percent)             0.875%    
Base Rate | Greater Than 1.60x Borrowings Base                  
Line of Credit Facility [Line Items]                  
Interest rate (as a percent)             0.75%    
London Interbank Offered Rate (LIBOR) | Interest rate swap | Designated as Hedging Instrument                  
Line of Credit Facility [Line Items]                  
Floating interest rate (as a percent)     1.658%            
2025 Notes                  
Line of Credit Facility [Line Items]                  
Principal amount       $ 300,000,000.0          
Debt instrument, stated interest rate       3.50%          
Net proceeds       $ 293,800,000          
Unaccreted discount       2,500,000          
Underwriting commissions       3,000,000.0          
Offering costs       $ 700,000          
2027 Notes                  
Line of Credit Facility [Line Items]                  
Principal amount     $ 350,000,000.0   $ 350,000,000.0   $ 350,000,000.0   350,000,000.0
Debt instrument, stated interest rate     2.70%   2.70%   2.70%    
Net proceeds     $ 344,800,000            
Unaccreted discount     1,000,000.0   $ 100,000   $ 100,000   200,000
Underwriting commissions     3,500,000            
Offering costs     $ 700,000            
Redemption price (as a percent)     100.00%            
2029 Notes                  
Line of Credit Facility [Line Items]                  
Principal amount   $ 300,000,000.0     $ 300,000,000.0   $ 300,000,000.0   300,000,000.0
Debt instrument, stated interest rate   7.10%     7.10%   7.10%    
Net proceeds   $ 292,900,000              
Unaccreted discount   3,500,000     $ 1,700,000   $ 1,700,000   2,100,000
Underwriting commissions   3,000,000.0              
Offering costs   $ 600,000              
Redemption price (as a percent)   100.00%              
2029 Notes | Interest rate swap | Designated as Hedging Instrument                  
Line of Credit Facility [Line Items]                  
Interest rate (as a percent)   7.10%              
Notional amount   $ 300,000,000.0              
2029 Notes | Secured Overnight Financing Rate (SOFR) | Interest rate swap | Designated as Hedging Instrument                  
Line of Credit Facility [Line Items]                  
Floating interest rate (as a percent)   3.1255%              
2030 Notes                  
Line of Credit Facility [Line Items]                  
Principal amount $ 300,000,000.0       $ 300,000,000.0   $ 300,000,000.0   300,000,000.0
Debt instrument, stated interest rate 6.34%       6.34%   6.34%    
Net proceeds $ 296,300,000                
Unaccreted discount 100,000       $ 0   $ 0   0
Underwriting commissions 3,000,000.0                
Offering costs $ 700,000                
Redemption price (as a percent) 100.00%                
2030 Notes | Interest rate swap | Designated as Hedging Instrument                  
Line of Credit Facility [Line Items]                  
Interest rate (as a percent) 6.34%                
Notional amount $ 300,000,000.0                
2030 Notes | Secured Overnight Financing Rate (SOFR) | Interest rate swap | Designated as Hedging Instrument                  
Line of Credit Facility [Line Items]                  
Floating interest rate (as a percent) 219.20%                
Revolving Credit Facility | Syndicated Facility payable | Line of Credit                  
Line of Credit Facility [Line Items]                  
Borrowing capacity         1,160,000,000   1,160,000,000    
Accordion feature, increase limit         $ 1,500,000,000   $ 1,500,000,000    
Debt instrument, covenant, total assets to total indebtedness, ratio, minimum threshold         1.50   1.50    
Debt instrument, covenant, consolidated EBITDA to consolidated interest expense, ratio, minimum threshold         2.25   2.25    
Credit facilities payable         $ 501,000,000.0   $ 501,000,000.0   545,000,000.0
Fair value         $ 501,000,000.0   $ 501,000,000.0   $ 545,000,000.0
Weighted average interest rate (as a percent)         5.744% 6.533% 5.744% 6.533%  
Interest expense inclusive of fees         $ 8,900,000 $ 9,700,000 $ 29,600,000 $ 27,500,000