Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Details)

v2.4.0.6
Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2011
2% Convertible Notes [Member]
Nov. 30, 2003
2% Convertible Notes [Member]
Earnings Per Share [Line Items]        
Net earnings $ 37,174 $ 25,890    
Plus: 2% Convertible Notes financing costs, net of taxes 511 456    
Interest rate on Convertible Notes     2.00% 2.00%
Net earnings for diluted earnings per share $ 37,685 $ 26,346    
Weighted average common shares outstanding for basic earnings per share 68,421,000 68,000,000    
Net effect of dilutive securities - equity based compensation plans 764,000 928,000    
Net effect of 2% Convertible Notes based on the if-converted method 5,957,000 5,948,000    
Weighted average common and equivalent shares outstanding for diluted earnings per share 75,142,000 74,876,000    
Basic Earnings Per Share: $ 0.54 $ 0.38    
Diluted Earnings Per Share: $ 0.50 $ 0.35    
Common stock shares excluded from computation of earnings per share 3,856,000 3,200,000