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Consolidated Statements of Stockholders’ Equity - USD ($)
$ in Millions
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss, net
Beginning balance at Sep. 30, 2022 $ 1,070.1 $ 0.5 $ (69.3) $ 339.9 $ 889.6 $ (90.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 238.5       238.5  
Other comprehensive income 38.8         38.8
Exercise of stock options 3.7     3.7    
Share-based compensation 28.0     28.0    
Ending balance at Sep. 30, 2023 1,379.1 0.5 (69.3) 371.6 1,128.1 (51.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 260.8       260.8  
Other comprehensive income 26.6         26.6
Exercise of stock options 7.7     7.7    
Shares withheld to cover taxes on vesting of equity awards (2.3)     (2.3)    
Share-based compensation 37.2     37.2    
Ending balance at Sep. 30, 2024 1,709.1 0.5 (69.3) 414.2 1,388.9 (25.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 305.9       305.9  
Other comprehensive income 9.2         9.2
Exercise of stock options 10.7     10.7    
Shares withheld to cover taxes on vesting of equity awards (6.6)     (6.6)    
Share-based compensation 49.0     49.0    
Acquisition consideration shares reissued from treasury 300.1   36.5 263.6    
Ending balance at Sep. 30, 2025 $ 2,377.4 $ 0.5 $ (32.8) $ 730.9 $ 1,694.8 $ (16.0)