Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Schedule Of Reconciliations Between Basic And Diluted Earnings Per Share) (Details)

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Earnings Per Share (Schedule Of Reconciliations Between Basic And Diluted Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
Earnings Per Share [Abstract]        
Net earnings from continuing operations $ 32,175 $ 22,142 $ 69,349 $ 48,803
Plus: 2% Convertible Notes financings costs, net of taxes 383 383 893 839
Interest rate on Convertible Notes 2.00% 2.00% 2.00% 2.00%
Net earnings for diluted earnings per share $ 32,558 $ 22,525 $ 70,242 $ 49,642
Weighted average common shares outstanding for basic earnings per share 68,064 68,270 68,242 68,135
Net effect of dilutive securities - equity based compensation plans 1,084 1,257 925 1,093
Net effect of 2% Convertible Notes based on the if-converted method 5,957 5,968 5,957 5,958
Weighted average common and equivalent shares outstanding for diluted earnings per share 75,105 75,495 75,124 75,186
Basic Earnings Per Share: $ 0.47 $ 0.32 $ 1.02 $ 0.72
Diluted Earnings Per Share: $ 0.43 $ 0.30 $ 0.94 $ 0.66
Anti-dilutive securities-equity based compensation plans (excluded from earnings per share calculation) 2,175 1,825 3,016 2,511