Condensed Consolidated Statements Of Earnings (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012	Jan. 31, 2011
Condensed Consolidated Statements Of Earnings [Abstract]
Net sales	$ 580,883	$ 537,105	$ 1,189,178	$ 1,074,014
Cost of sales	380,066	347,562	773,427	696,381
Gross margin	200,817	189,543	415,751	377,633
Operating expenses	126,049	122,102	250,656	235,689
Operating income, net	74,768	67,441	165,095	141,944
Interest expense	2,899	2,936	6,069	6,589
Other income, net	(4,550)	(3,502)	(9,410)	(4,609)
Earnings before income taxes	76,419	68,007	168,436	139,964
Income taxes	22,598	23,428	46,062	42,251
Net earnings	$ 53,821	$ 44,579	$ 122,374	$ 97,713
Weighted average shares - basic	75,052,805	77,580,064	75,154,873	77,375,086
Weighted average shares - diluted	76,412,785	78,977,509	76,480,673	78,766,895
Net earnings per share - basic	$ 0.72	$ 0.57	$ 1.63	$ 1.26
Net earnings per share - diluted	$ 0.70	$ 0.56	$ 1.60	$ 1.24
Dividends paid per share	$ 0.150	$ 0.130	$ 0.300	$ 0.255