Condensed Consolidated Statements Of Earnings (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Condensed Consolidated Statements Of Earnings [Abstract]      
Net sales $ 2,493,248 $ 2,294,029 $ 1,877,064
Cost of sales 1,619,485 1,480,233 1,218,316
Gross margin 873,763 813,796 658,748
Selling, general and administrative 451,158 443,227 376,018
Research and development 59,589 55,286 44,486
Operating income 363,016 315,283 238,244
Interest expense 11,489 12,525 11,975
Other income, net (19,253) (9,505) (3,907)
Earnings before income taxes 370,780 312,263 230,176
Income taxes 106,479 86,972 64,013
Net earnings $ 264,301 $ 225,291 $ 166,163
Weighted average shares - basic 150,286,403 154,392,740 155,697,056
Weighted average shares - diluted 152,940,605 157,196,918 158,355,544
Net earnings per share - basic $ 1.76 $ 1.46 $ 1.07
Net earnings per share - diluted $ 1.73 $ 1.43 $ 1.05