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, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Net sales        
Net sales, As reported $ 327,770 $ 300,468 $ 667,326 $ 608,277
Net sales, Pro forma 327,770 321,923 667,326 654,665
Earnings from continuing operations        
Earnings from continuing operations, As reported 22,304 25,834 55,309 56,385
Earnings from continuing operations, Pro Forma $ 22,304 $ 27,195 $ 55,309 $ 60,868
Basic earnings per share from continuing operations        
Basic earnings per share from continuing operations, As reported (in dollars per share) $ 0.31 $ 0.35 $ 0.76 $ 0.77
Basic earnings per share from continuing operations, Pro Forma (in dollars per share) $ 0.31 $ 0.37 $ 0.76 $ 0.84
Diluted earnings per share from continuing operations        
Diluted earnings per share from continuing operations, As reported (in dollars per share) $ 0.30 $ 0.35 $ 0.74 $ 0.76
Diluted earnings per share from continuing operations, Pro Forma (in dollars per share) $ 0.30 $ 0.37 $ 0.74 $ 0.82