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Consolidated Statement Of Stockholders' Equity - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Common stock
Additional paid-in capital
Accumulated deficit
Accumulated deficit
Cumulative Effect, Period of Adoption, Adjustment
Accumulated other comprehensive income (loss)
Stock-based Compensation Related [Member]
Balance at Sep. 30, 2020 $ 640.7 $ (0.1) $ 1.6 $ 1,378.0 $ (714.2) $ (0.1) $ (24.7)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net Income (Loss) Attributable to Parent 70.4       70.4      
Dividends declared (34.8)     (34.8)        
Stock-based compensation 8.1     8.1        
Stock issued under stock compensation plans 1.9     1.9        
Stock repurchased under buyback program (10.0)     (10.0)        
Other Comprehensive Income (Loss), Net of Tax 19.7           19.7  
Balance at Sep. 30, 2021 694.9   1.6 1,342.2 (643.9)   (5.0)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation (1.0)     (1.0)        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 19.7              
Net Income (Loss) Attributable to Parent 76.6       76.6      
Dividends declared (36.5)     (36.5)        
Stock-based compensation 8.7     8.7        
Stock issued under stock compensation plans 2.0     2.0        
Stock repurchased under buyback program (35.0)     (35.0)        
Other Comprehensive Income (Loss), Net of Tax (39.6)           (39.6)  
Balance at Sep. 30, 2022 669.3              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation (1.8)     (1.8)        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (39.6)              
Stockholders' Equity Attributable to Parent 669.3   1.6 1,279.6 (567.3)   (44.6)  
Net Income (Loss) Attributable to Parent 85.5       85.5      
Dividends declared (38.1)     (38.1)        
Stock-based compensation 8.5     8.5        
Stock issued under stock compensation plans 2.7     2.7        
Stock repurchased under buyback program (10.0)     (10.0)        
Other Comprehensive Income (Loss), Net of Tax (4.1)              
Balance at Sep. 30, 2023 711.5              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation       (2.3)       $ (2.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (4.1)           (4.1)  
Stockholders' Equity Attributable to Parent $ 711.5   $ 1.6 $ 1,240.4 $ (481.8)   $ (48.7)