v3.26.3
Subsequent Events (Details) - USD ($)
 3 Months Ended 12 Months Ended
Nov. 04, 2026
Oct. 29, 2026
Oct. 14, 2026
Oct. 06, 2026
Feb. 10, 2026
Oct. 30, 2020
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Nov. 03, 2026
May 27, 2021
Aug. 24, 2011
Subsequent Event [Line Items]                          
Total Amount Outstanding             $ 1,521,525,000   $ 1,860,649,000        
Stock repurchase program, authorized amount                         $ 100,000,000
Stock repurchase program, remaining authorized repurchase amount             $ 65,860,000            
Temporary equity, liquidation preference (usd per share)             $ 25.00   $ 25.00        
7.50% Preferred Stock                          
Subsequent Event [Line Items]                          
Dividend rate             7.50%   7.50%        
5.50% Preferred Stock                          
Subsequent Event [Line Items]                          
Dividend rate         5.50% 5.50% 5.50% 5.50% 5.50% 5.50%      
Temporary equity, liquidation preference (usd per share)         $ 25.00                
6.50% Preferred Stock                          
Subsequent Event [Line Items]                          
Dividend rate             6.50% 6.50% 6.50% 6.50%      
Subsequent Event                          
Subsequent Event [Line Items]                          
Share repurchase increase in authorized amount                     $ 100,000    
Stock repurchase program, authorized amount                     200,000    
Stock repurchase program, remaining authorized repurchase amount                     $ 165,860,000    
Subsequent Event | O 2027 M6 Dividends                          
Subsequent Event [Line Items]                          
Amount ($ per share), common stock (usd per share) $ 0.0350                        
Subsequent Event | O 2027 M6 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods 0.135417                        
Subsequent Event | O 2027 M7 Dividends                          
Subsequent Event [Line Items]                          
Amount ($ per share), common stock (usd per share) 0.0350                        
Subsequent Event | O 2027 M7 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods 0.135417                        
Subsequent Event | O 2027 M8 Dividends                          
Subsequent Event [Line Items]                          
Amount ($ per share), common stock (usd per share) 0.0350                        
Subsequent Event | O 2027 M8 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods $ 0.135417                        
Subsequent Event | 7.50% Preferred Stock                          
Subsequent Event [Line Items]                          
Dividend rate 7.50%                        
Temporary equity, liquidation preference (usd per share) $ 25.00                        
Subsequent Event | 7.50% Preferred Stock | O 2027 M6 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods 0.156250                        
Subsequent Event | 7.50% Preferred Stock | O 2027 M7 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods 0.156250                        
Subsequent Event | 7.50% Preferred Stock | O 2027 M8 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods $ 0.156250                        
Subsequent Event | Floating Rate Preferred Stock                          
Subsequent Event [Line Items]                          
Dividend rate 6.50%                        
Temporary equity, liquidation preference (usd per share) $ 25.00                        
Subsequent Event | 5.50% Preferred Stock                          
Subsequent Event [Line Items]                          
Dividend rate 5.50%                        
Temporary equity, liquidation preference (usd per share) $ 25.00                        
Subsequent Event | 5.50% Preferred Stock | O 2027 M6 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods 0.114583                        
Subsequent Event | 5.50% Preferred Stock | O 2027 M7 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods 0.114583                        
Subsequent Event | 5.50% Preferred Stock | O 2027 M8 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods $ 0.114583                        
Subsequent Event | 6.50% Preferred Stock                          
Subsequent Event [Line Items]                          
Dividend rate 6.50%                        
Temporary equity, liquidation preference (usd per share) $ 25.00                        
Subsequent Event | 6.50% Preferred Stock | O 2027 M6 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods 0.135417                        
Subsequent Event | 6.50% Preferred Stock | O 2027 M7 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods 0.135417                        
Subsequent Event | 6.50% Preferred Stock | O 2027 M8 Dividends | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods $ 0.135417                        
Subsequent Event | 5.35% Preferred Stock                          
Subsequent Event [Line Items]                          
Dividend rate 5.35%                        
Temporary equity, liquidation preference (usd per share) $ 25.00                        
Subsequent Event | 5.35% Preferred Stock | Preferred Stock                          
Subsequent Event [Line Items]                          
Amount ($ per share), before pro ration for partial periods $ 0.334375                        
Subsequent Event | BCPE North Start US Holdco 2, Inc. | Second Lien Debt                          
Subsequent Event [Line Items]                          
Repayment of loan receivable       $ 69,388,000                  
3.364% 2026 Notes                          
Subsequent Event [Line Items]                          
Stated rate             3.364%            
3.364% 2026 Notes | Unsecured Debt                          
Subsequent Event [Line Items]                          
Notes             $ 263,220,000   $ 264,486,000        
Stated rate             3.364%   3.364%     3.364%  
Total Amount Outstanding             $ 263,056,000   $ 264,051,000        
3.364% 2026 Notes | Unsecured Debt | Subsequent Event                          
Subsequent Event [Line Items]                          
Notes     $ 263,220,000                    
Stated rate     3.364%                    
Redemption price rate     100.00%                    
8.95% 2031 Notes | Subsequent Event                          
Subsequent Event [Line Items]                          
Stated rate   8.95%                      
Total Amount Outstanding   $ 300,000,000                      
Net proceeds after deducting estimated offering expenses   $ 283,400,000