Condensed Consolidated Statements Of Earnings (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Condensed Consolidated Statements Of Earnings [Abstract]
Net sales	$ 608,295	$ 536,909
Cost of sales	393,361	348,819
Gross margin	214,934	188,090
Operating expenses	124,607	113,587
Operating income, net	90,327	74,503
Interest expense	3,170	3,653
Other income, net	(4,860)	(1,107)
Earnings before income taxes	92,017	71,957
Income taxes	23,464	18,823
Net earnings	$ 68,553	$ 53,134
Weighted average shares - basic	75,256,946	77,169,260
Weighted average shares - diluted	76,523,599	78,484,455
Net earnings per share - basic	$ 0.91	$ 0.69
Net earnings per share - diluted	$ 0.90	$ 0.68
Dividends paid per share	$ 0.150	$ 0.125