Condensed Consolidated Statements of Operations and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Net Sales	$ 741,600	$ 596,970	$ 1,617,212	$ 1,269,970
Cost of products sold	668,204	537,590	1,443,224	1,135,612
Gross profit	73,396	59,380	173,988	134,358
Selling, general and administrative expenses	46,187	36,245	97,652	74,705
Amortization of intangible assets	2,794	2,777	5,562	5,624
Interest income	735	991	1,514	2,060
Interest expense	87	127	167	270
Other income, net	468	274	1,021	325
Income before income taxes	25,531	21,496	73,142	56,144
Income taxes	5,635	7,816	22,258	20,106
Net income	19,896	13,680	50,884	36,038
Weighted average common shares outstanding:
Basic	53,002,106	54,587,293	52,965,286	54,789,738
Diluted	53,116,389	54,625,747	53,075,985	54,819,877
Earnings per common share:
Basic	$ 0.38	$ 0.25	$ 0.96	$ 0.66
Diluted	$ 0.37	$ 0.25	$ 0.96	$ 0.66
Net income	19,896	13,680	50,884	36,038
Unrealized appreciation (depreciation) on investments, net of tax	16	16	17	(15)
Comprehensive income	$ 19,912	$ 13,696	$ 50,901	$ 36,023
Regular Dividend
Earnings per common share:
Dividends declared and paid per common share:	$ 0.18	$ 0.15	$ 0.36	$ 0.30
Special Dividend
Earnings per common share:
Dividends declared and paid per common share:	$ 1.50		$ 1.50