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Quarterly Financial Information (Quarterly Financial Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Quarterly Financial Information [Abstract]                      
Net Sales $ 656,833 $ 647,237 $ 580,883 $ 608,295 $ 625,450 $ 594,565 $ 537,105 $ 536,909 $ 2,493,248 $ 2,294,029 $ 1,877,064
Gross margin 229,783 228,229 200,817 214,934 227,005 209,158 189,543 188,090 873,763 813,796 658,748
Net earnings $ 70,981 $ 70,946 $ 53,821 $ 68,553 $ 65,767 $ 61,811 $ 44,579 $ 53,134 $ 264,301 $ 225,291 $ 166,163
Basic earnings per share $ 0.47 $ 0.47 $ 0.36 $ 0.46 $ 0.43 $ 0.40 $ 0.29 $ 0.34 $ 1.76 $ 1.46 $ 1.07
Diluted earnings per share $ 0.47 $ 0.46 $ 0.35 $ 0.45 $ 0.42 $ 0.39 $ 0.28 $ 0.34 $ 1.73 $ 1.43 $ 1.05
Dividends declared per share $ 0.090 $ 0.090 $ 0.080 $ 0.075 $ 0.150   $ 0.130   $ 0.335 $ 0.28 $ 0.24
Dividends paid per share $ 0.090 $ 0.080 $ 0.075 $ 0.075 $ 0.075 $ 0.065 $ 0.065 $ 0.063