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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Amount
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss Items
Treasury Stock, at cost
Beginning balance at Aug. 31, 2016 $ 1,659.8 $ 0.5 $ 856.4 $ 1,360.9 $ (139.4) $ (418.6)
Beginning balance (in shares) at Aug. 31, 2016   43.7        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 321.7     321.7    
Other comprehensive income (loss) 39.7       39.7  
Amortization, issuance, and cancellations of restricted stock grants (in shares)   0.1        
Amortization, issuance, and cancellations of restricted stock grants 16.8   16.4     0.4
Employee stock purchase plan issuances 0.9   0.9      
Cash dividends paid on common stock (22.7)     (22.7)    
Stock options exercised 2.1   2.1      
Repurchases of common stock (in shares)   (2.0)        
Repurchases of common stock (357.9)         (357.9)
Excess tax benefits from share-based payments 5.2   5.2      
Ending balance at Aug. 31, 2017 1,665.6 $ 0.5 881.0 1,659.9 (99.7) (776.1)
Ending balance (in shares) at Aug. 31, 2017   41.8        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 349.6     349.6    
Other comprehensive income (loss) (4.0)       (4.0)  
Reclassification of stranded tax effects of the Tax Cuts and Jobs Act 0.0     11.1 (11.1)  
Amortization, issuance, and cancellations of restricted stock grants (in shares)   0.2        
Amortization, issuance, and cancellations of restricted stock grants 23.7   23.6     0.1
Employee stock purchase plan issuances 0.6   0.6      
Cash dividends paid on common stock (21.4)     (21.4)    
Stock options exercised 1.1   1.1      
Repurchases of common stock (in shares)   (2.0)        
Repurchases of common stock (298.4)         (298.4)
Ending balance at Aug. 31, 2018 1,716.8 $ 0.5 906.3 1,999.2 (114.8) (1,074.4)
Ending balance (in shares) at Aug. 31, 2018   40.0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 330.4     330.4    
Other comprehensive income (loss) (36.6)       (36.6)  
Amortization, issuance, and cancellations of restricted stock grants (in shares)   0.2        
Amortization, issuance, and cancellations of restricted stock grants 23.1   23.1      
Employee stock purchase plan issuances 0.6   0.6      
Cash dividends paid on common stock (20.8)     (20.8)    
Repurchases of common stock (in shares)   (0.7)        
Repurchases of common stock (81.6)         (81.6)
Ending balance at Aug. 31, 2019 $ 1,918.9 $ 0.5 $ 930.0 $ 2,295.8 $ (151.4) $ (1,156.0)
Ending balance (in shares) at Aug. 31, 2019   39.5