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