Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Proforma Results of Operations (Detail)

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Acquisitions - Proforma Results of Operations (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Net sales        
Net sales, As reported $ 370,370 $ 378,024 $ 747,618 $ 770,823
Net sales, Pro forma 370,370 395,154 747,618 810,941
Net earnings        
Net earnings, As reported 28,435 32,175 64,778 69,349
Net earnings, Pro Forma $ 28,508 $ 32,695 $ 65,010 $ 72,785
Basic earnings per share        
Basic earnings per share, As reported (in dollars per share) $ 0.39 $ 0.47 $ 0.89 $ 1.02
Basic earnings per share, Pro Forma (in dollars per share) $ 0.39 $ 0.48 $ 0.89 $ 1.07
Diluted earnings per share        
Diluted earnings per share, As reported (in dollars per share) $ 0.38 $ 0.43 $ 0.87 $ 0.94
Diluted earnings per share, Pro Forma (in dollars per share) $ 0.38 $ 0.44 $ 0.87 $ 0.98