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Quarterly Financial Information (Quarterly Financial Information) (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended 12 Months Ended
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2010
Apr. 30, 2010
Jan. 31, 2010
Oct. 31, 2009
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Quarterly Financial Information                      
Net Sales $ 625,450 $ 594,565 $ 537,105 $ 536,909 $ 515,243 $ 497,619 $ 436,122 $ 428,080 $ 2,294,029 $ 1,877,064 $ 1,868,629
Gross margin 227,005 209,158 189,543 188,090 187,030 177,371 145,947 148,400 813,796 658,748 589,706
Net earnings $ 65,767 $ 61,811 $ 44,579 $ 53,134 $ 51,170 $ 49,458 $ 30,966 $ 34,569 $ 225,291 $ 166,163 $ 131,907
Basic earnings per share $ 0.86 $ 0.80 $ 0.57 $ 0.69 $ 0.66 $ 0.64 $ 0.40 $ 0.44 $ 2.92 $ 2.13 $ 1.69
Diluted earnings per share $ 0.84 $ 0.79 $ 0.56 $ 0.68 $ 0.65 $ 0.62 $ 0.39 $ 0.44 $ 2.87 $ 2.10 $ 1.67
Dividends declared per share $ 0.300   $ 0.260   $ 0.245 $ 0.120 $ 0.115   $ 0.56 $ 0.48 $ 0.46
Dividends paid per share $ 0.150 $ 0.130 $ 0.130 $ 0.125 $ 0.120 $ 0.120 $ 0.115 $ 0.115