Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2011	Apr. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 852,059	$ 680,192	$ 1,984,970	$ 1,612,769
Cost of products sold	743,575	587,693	1,752,265	1,400,503
Gross profit	108,484	92,499	232,705	212,266
Selling, general and administrative expenses	50,386	42,824	136,019	108,678
Impairment of trademarks	1,430	500	3,466	500
Amortization of intangibles	2,734	152	7,298	320
Gain on involuntary conversion	1,818	2,283	8,651	2,283
Interest income	949	1,360	2,950	4,242
Interest expense	45	110	152	320
Other income (expense)	662	(351)	1,114	(262)
Income before income taxes	57,318	52,205	98,485	108,711
Income taxes	17,310	18,094	29,101	39,247
Net income	$ 40,008	$ 34,111	$ 69,384	$ 69,464
Average common shares outstanding:
Basic	55,829,122	51,461,181	55,079,700	53,521,242
Diluted	55,941,389	51,585,450	55,185,181	53,621,854
Earnings per common share:
Basic	$ 0.72	$ 0.66	$ 1.26	$ 1.30
Diluted	$ 0.72	$ 0.66	$ 1.26	$ 1.30
Regular dividends declared and paid per common share:	$ 0.10	$ 0.07	$ 0.30	$ 0.21
Special dividends declared and paid per common share:				$ 0.50