Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Detail)

v2.4.0.6
Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 1 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Mar. 31, 2012
2% Convertible Notes
Convertible Notes Payable
Feb. 28, 2013
2% Convertible Notes
Convertible Notes Payable
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Net earnings $ 28,435 $ 32,175 $ 64,778 $ 69,349    
Plus: 2% Convertible Notes financing costs, net of taxes 0 383 0 893    
Net earnings for diluted earnings per share $ 28,435 $ 32,558 $ 64,778 $ 70,242    
Weighted average common shares outstanding for basic earnings per share 72,946,000 68,064,000 72,869,000 68,242,000    
Net effect of dilutive securities—equity based compensation plans 1,470,000 1,084,000 1,474,000 925,000    
Net effect of 2% Convertible Notes based on the if-converted method 0 5,957,000 0 5,957,000    
Weighted average common and equivalent shares outstanding for diluted earnings per share 74,416,000 75,105,000 74,343,000 75,124,000    
Basic Earnings Per Share (in dollars per share): $ 0.39 $ 0.47 $ 0.89 $ 1.02    
Diluted Earnings Per Share (in dollars per share): $ 0.38 $ 0.43 $ 0.87 $ 0.94    
Anti-dilutive securities-equity based compensation plans (excluded from earnings per share calculation) 759,000 2,175,000 774,000 3,016,000    
Number of shares issued due to calling of convertible notes         5,951,440  
Debt instrument, interest rate         2.00% 2.00%