Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Detail)

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Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 327,260 $ 344,205 $ 300,468 $ 307,809 $ 322,368 $ 343,268 $ 300,919 $ 309,966 $ 1,279,742 $ 1,276,521 $ 1,159,310
Gross profit 129,500 136,904 116,178 124,368 129,608 138,754 116,083 127,015 506,950 511,460 464,802
Earnings from continuing operations 45,115 46,077 25,834 30,551 35,916 27,737 27,653 33,970 147,577 125,276 110,188
Earnings (loss) from discontinued operations 13,138 (139,060) 2,601 5,792 (52,376) 6,664 4,522 3,204 (117,529) (37,986) 1,371
Net earnings $ 58,253 $ (92,983) $ 28,435 $ 36,343 $ (16,460) $ 34,401 $ 32,175 $ 37,174 $ 30,048 $ 87,290 $ 111,559
Earnings from continuing operations per share:                      
Basic (in dollars per share) $ 0.62 $ 0.63 $ 0.35 $ 0.42 $ 0.49 $ 0.39 $ 0.41 $ 0.50 $ 2.02 $ 1.79 $ 1.61
Diluted (in dollars per share) $ 0.60 $ 0.62 $ 0.35 $ 0.41 $ 0.48 $ 0.36 $ 0.37 $ 0.46 $ 1.98 $ 1.68 $ 1.49
Earnings (loss) from discontinued operations per share:                      
Basic $ 0.18 $ (1.90) $ 0.04 $ 0.08 $ (0.72) $ 0.09 $ 0.06 $ 0.04 $ (1.61) $ (0.54)  
Diluted $ 0.18 $ (1.86) $ 0.03 $ 0.08 $ (0.70) $ 0.09 $ 0.06 $ 0.04 $ (1.58) $ (0.51)  
Net earnings (loss) per share:                      
Basic (in dollars per share) $ 0.80 $ (1.27) $ 0.39 $ 0.50 $ (0.23) $ 0.48 $ 0.47 $ 0.54 $ 0.41 $ 1.25 $ 1.63
Diluted (in dollars per share) $ 0.78 $ (1.24) $ 0.38 $ 0.49 $ (0.22) $ 0.45 $ 0.43 $ 0.50 $ 0.40 $ 1.17 $ 1.50