Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Detail)

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Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Aug. 31, 2015
May. 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
May. 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Quarterly Financial Information Disclosure [Line Items]                      
Net sales                 $ 1,249,254 $ 1,399,862 $ 1,279,742
Gross profit                 461,841 546,872 506,950
Earnings from continuing operations                 19,872 141,453 147,577
Earnings (loss) from discontinued operations                 0 22,120 (117,529)
Net earnings                 $ 19,872 $ 163,573 $ 30,048
Earnings from continuing operations per share:                      
Basic (in dollars per share)                 $ 0.32 $ 1.99 $ 2.02
Diluted (in dollars per share)                 0.32 1.95 1.98
Earnings (loss) from discontinued operations per share:                      
Basic                   0.32  
Diluted                   0.32  
Net earnings (loss) per share:                      
Basic (in dollars per share)                 0.32 2.31 0.41
Diluted (in dollars per share)                 $ 0.32 $ 2.26 $ 0.40
Quarterly unaudited data [Member]                      
Quarterly Financial Information Disclosure [Line Items]                      
Net sales $ 300,384 $ 320,100 $ 301,005 $ 327,765 $ 354,349 $ 378,187 $ 327,770 $ 339,556      
Gross profit 106,542 118,560 109,763 126,976 142,095 148,550 124,447 131,780      
Earnings from continuing operations         35,587 50,557 22,304 33,005      
Earnings (loss) from discontinued operations         0 0 19,088 3,032      
Net earnings $ 22,078 $ 37,958 $ (64,838) $ 24,674 $ 35,587 $ 50,557 $ 41,392 $ 36,037      
Earnings from continuing operations per share:                      
Basic (in dollars per share)         $ 0.52 $ 0.72 $ 0.31 $ 0.45      
Diluted (in dollars per share)         0.51 0.70 0.30 0.44      
Earnings (loss) from discontinued operations per share:                      
Basic         0.00 0.00 0.26 0.04      
Diluted         0.00 0.00 0.26 0.04      
Net earnings (loss) per share:                      
Basic (in dollars per share) $ 0.37 $ 0.64 $ (1.05) $ 0.38 0.52 0.72 0.57 0.49      
Diluted (in dollars per share) $ 0.37 $ 0.63 $ (1.05) $ 0.38 $ 0.51 $ 0.70 $ 0.56 $ 0.48