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Consolidated Statements of Stockholders’ Equity - USD ($)
shares in Millions, $ in Millions
Total
Common stock
Paid-in capital
Retained earnings
Accumulated other comprehensive (loss) income
Common stock outstanding, beginning balance (in shares) at Sep. 30, 2022   176.1      
Balance at beginning of period at Sep. 30, 2022 $ 306.6 $ 1.8 $ 44.1 $ 282.0 $ (21.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 1,419.7     1,419.7  
Dividends paid (21.8)   0.1 (21.9)  
Stock-based compensation, net of issuances (in shares)   0.5      
Stock-based compensation, net of issuances 3.8   3.8    
Repurchase of common stock (in shares)   (41.8)      
Repurchases of common stock (1,539.6) $ (0.5)   (1,539.1)  
Other comprehensive income, net of tax 34.5       34.5
Common stock outstanding, ending balance (in shares) at Sep. 30, 2023   134.8      
Balance at end of period at Sep. 30, 2023 203.2 $ 1.3 48.0 140.7 13.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 211.5     211.5  
Stock-based compensation, net of issuances (in shares)   0.4      
Stock-based compensation, net of issuances 3.2   3.2    
Repurchase of common stock (in shares)   (6.7)      
Repurchases of common stock (229.0)     (229.0)  
Other comprehensive income, net of tax $ (3.3)       (3.3)
Common stock outstanding, ending balance (in shares) at Sep. 30, 2024 128.5 128.5      
Balance at end of period at Sep. 30, 2024 $ 185.6 $ 1.3 51.2 123.2 9.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 210.7     210.7  
Stock-based compensation, net of issuances (in shares)   0.2      
Stock-based compensation, net of issuances 7.2   7.2    
Repurchase of common stock (in shares)   (1.6)      
Repurchases of common stock (60.3)     (60.3)  
Other comprehensive income, net of tax $ (4.7)       (4.7)
Common stock outstanding, ending balance (in shares) at Sep. 30, 2025 127.1 127.1      
Balance at end of period at Sep. 30, 2025 $ 338.5 $ 1.3 $ 58.4 $ 273.6 $ 5.2