Annual report [Section 13 and 15(d), not S-K Item 405]

Equity - Narrative (Details)

v3.25.3
Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 12 Months Ended
Nov. 21, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Stock-based compensation        
Shares reserved for future issuance (in shares)   1,900,000    
Granted (in dollars per share)   $ 76.36 $ 82.61 $ 70.38
Deferred vested award (in shares)   292,000    
Share-based compensation expense   $ 41.2 $ 35.3 $ 29.5
Income tax benefit recognized   12.4 11.0 8.1
Unrecognized compensation cost   $ 47.4    
Unrecognized compensation costs, period for recognition   4 years    
Total fair value   $ 42.3 $ 39.6 29.8
Intrinsic value vested   84.6    
Stock repurchase programs, authorized amount   $ 400.0    
Common shares repurchased (in shares)   5,800,000 900,000  
Repurchases of common stock   $ 456.6 $ 73.1 $ 0.0
Amount remaining available for future stock repurchases   280.8    
Subsequent Event        
Stock-based compensation        
Common shares repurchased (in shares) 400,000      
Repurchases of common stock $ 30.7      
June 2024 Resolution Adoptions        
Stock-based compensation        
Stock repurchase programs, authorized amount   200.0    
December 2024 Resolution Adoptions        
Stock-based compensation        
Stock repurchase programs, authorized amount   $ 200.0    
Performance Stock Units        
Stock-based compensation        
Vesting period   3 years    
Unrecognized compensation costs, period for recognition   3 years    
Employee | Restricted Stock Units        
Stock-based compensation        
Vesting period   3 years    
Employee | Performance Stock Units        
Stock-based compensation        
Vesting period   3 years    
Member of Board of Directors | Restricted Stock Units        
Stock-based compensation        
Vesting period   1 year    
Minimum | Performance Stock Units        
Stock-based compensation        
Vesting rights, percentage   0.00%    
Minimum | Employee | Restricted Stock Units        
Stock-based compensation        
Vesting period   3 years    
Maximum | Performance Stock Units        
Stock-based compensation        
Vesting rights, percentage   200.00%    
Maximum | Employee | Restricted Stock Units        
Stock-based compensation        
Vesting period   4 years    
Average        
Stock-based compensation        
Unrecognized compensation costs, period for recognition   1 year 1 month 6 days