Annual report pursuant to Section 13 and 15(d)

Basic and Diluted Earnings Per Share (Detail)

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Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Aug. 31, 2014
May 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Earnings Per Share [Abstract]                      
Net earnings $ 35,587 $ 50,557 $ 41,392 $ 36,037 $ 58,253 $ (92,983) $ 28,435 $ 36,343 $ 163,573 $ 30,048 $ 87,290
Plus: 2% Convertible Notes financings costs, net of taxes                 0 0 425
Net earnings for diluted earnings per share                 $ 163,573 $ 30,048 $ 87,715
Weighted average common shares outstanding for basic earnings per share                 70,942 72,979 70,099
Net effect of dilutive securities-employee stock compensation plans                 1,544 1,601 1,119
Net effect of 2% Convertible Notes based on the if-converted method                 0 0 3,722
Weighted average common and equivalent shares outstanding for diluted earnings per share                 72,486 74,580 74,940
Basic Earnings Per Share (in dollars per share): $ 0.52 $ 0.72 $ 0.57 $ 0.49 $ 0.80 $ (1.27) $ 0.39 $ 0.50 $ 2.31 $ 0.41 $ 1.25
Diluted Earnings Per Share (in dollars per share): $ 0.51 $ 0.70 $ 0.56 $ 0.48 $ 0.78 $ (1.24) $ 0.38 $ 0.49 $ 2.26 $ 0.40 $ 1.17