Annual report pursuant to Section 13 and 15(d)

Share Repurchases - Additional Information (Detail)

v3.3.0.814
Share Repurchases - Additional Information (Detail) - $ / shares
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Mar. 16, 2015
Oct. 01, 2014
Mar. 19, 2014
Sep. 28, 2011
Capital Unit [Line Items]              
Cumulative Preferred Stock, shares authorized share 160,000            
Cumulative Preferred Stock, par value $ 1            
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 19,726,479 12,195,359          
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 8,273,521            
Anti-dilutive securities-equity based compensation plans (excluded from earnings per share calculation) 2,056,000 522,000 619,000        
Common Class A              
Capital Unit [Line Items]              
Common stock, shares authorized 168,000,000 168,000,000          
Common stock, par value $ 0.2 $ 0.2          
Common stock, shares issued 78,932,533 78,480,780          
Common stock, shares outstanding 59,206,054            
Common Class B              
Capital Unit [Line Items]              
Common stock, shares authorized 1,500,000            
Common stock, par value $ 0.2            
Common stock, shares issued 0            
Common stock, shares outstanding   0