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, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Nov. 30, 2010
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Schedule Of Earnings Per Share Basic And Diluted [Line Items]                      
Net earnings $ (16,460) $ 34,401 $ 32,175 $ 37,174 $ 41,382 $ 36,358 $ 7,929 $ 25,890 $ 87,290 $ 111,559 $ 24,031
Plus: 2% Convertible Notes financings costs, net of taxes                 425 1,755 1,898
Net earnings for diluted earnings per share                 $ 87,715 $ 113,314 $ 25,929
Weighted average common shares outstanding for basic earnings per share                 70,099 68,254 67,624
Net effect of dilutive securities-employee stock compensation plans                 1,119 1,089 661
Net effect of 2% Convertible Notes based on the if-converted method                 3,722 5,962 5,924
Weighted average common and equivalent shares outstanding for diluted earnings per share                 74,940 75,305 74,209
Basic Earnings Per Share: $ (0.23) $ 0.48 $ 0.47 $ 0.54 $ 0.61 $ 0.53 $ 0.12 $ 0.38 $ 1.25 $ 1.63 $ 0.36
Diluted Earnings Per Share: $ (0.23) $ 0.45 $ 0.43 $ 0.50 $ 0.55 $ 0.49 $ 0.11 $ 0.35 $ 1.17 $ 1.50 $ 0.35