Annual report pursuant to Section 13 and 15(d)

Stocks Plans - Additional Information (Detail)

v2.4.0.8
Stocks Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Class A Common Stock were authorized for issuance 9,400,000  
Shares available for future grants 3,915,647  
Exercise price as percentage of fair market value at grant date 100.00%  
Unrecognized compensation cost related to share-based compensation for stock options and restricted stock outstanding $ 23.5  
Unrecognized compensation cost related to share-based compensation for stock options and restricted stock outstanding, recognition period 2 years 11 months  
Performance Shares
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance period 3 years  
Performance Shares | Free Cash Flow Conversion Target
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%  
Performance Shares | Total Shareholders Return
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%  
Restricted Stock
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares vested $ 17.9 $ 6.2
After Three Years
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%  
After Five Years
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%  
Maximum | Stock Options
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options term 10 years