Annual report pursuant to Section 13 and 15(d)

Capital Stock Share Repurchases - Additional Information (Details)

v3.21.2
Capital Stock Share Repurchases - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 31, 2020
Aug. 31, 2021
Mar. 16, 2015
Oct. 01, 2014
Mar. 29, 2014
Sep. 28, 2011
Capital Unit [Line Items]            
Common stock, shares authorized 168,000,000 168,000,000        
Common stock, par value $ 0.20 $ 0.20        
Common stock, shares issued 82,593,945 83,021,654        
Cumulative Preferred Stock, shares authorized share   160,000        
Cumulative Preferred Stock, par value   $ 1.00        
Cumulative Preferred Stock, issued   0        
Shares authorized in buyback program     7,000,000 7,000,000 7,000,000 7,000,000
Treasury stock, shares 22,799,230 22,799,230        
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased   5,200,770        
Stock Repurchased During Period, Shares 1,343,662          
Stock Repurchased During Period, Value $ 27.5          
Common Class A            
Capital Unit [Line Items]            
Common stock, shares authorized   168,000,000        
Common stock, par value   $ 0.20        
Common stock, shares issued   83,021,654        
Common stock, shares outstanding   60,222,424        
Common Class B            
Capital Unit [Line Items]            
Common stock, shares authorized   1,500,000        
Common stock, par value   $ 0.20        
Common stock, shares issued   0        
Common stock, shares outstanding 0