Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Detail)

v2.4.0.8
Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 1 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Mar. 31, 2012
2% Convertible Notes
Convertible Notes Payable
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Income (Loss) from Continuing Operations Attributable to Parent $ 46,077 $ 27,737 $ 102,462 $ 89,360  
Plus: 2% Convertible Notes financing costs, net of taxes 0 (468) 0 425  
Earnings from continuing operations for diluted earnings per share $ 46,077 $ 27,269 $ 102,462 $ 89,785  
Weighted average common shares outstanding for basic earnings per share 73,133,000 71,083,000 72,957,000 69,184,000  
Net effect of dilutive securities—stock based compensation plans 1,654,000 1,310,000 1,534,000 1,053,000  
Net effect of 2% Convertible Notes based on the if-converted method 0 2,978,000 0 4,964,000  
Weighted average common and equivalent shares outstanding for diluted earnings per share 74,787,000 75,371,000 74,491,000 75,201,000  
Basic Earnings Per Share (in dollars per share): $ (1.27) $ 0.48 $ (0.39) $ 1.50  
Diluted Earnings Per Share (in dollars per share): $ (1.24) $ 0.45 $ (0.38) $ 1.39  
Anti-dilutive securities-stock based compensation plans (excluded from earnings per share calculation) 656,000 2,173,000 735,000 2,735,000  
Number of shares issued due to calling of convertible notes         5,951,440
Debt instrument, interest rate         2.00%