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Condensed Consolidated Statements Of Operations (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 Operations [Abstract]        
Net sales $ 596,970 $ 526,227 $ 1,269,970 $ 1,132,911
Cost of products sold 537,590 478,584 1,135,612 1,008,690
Gross profit 59,380 47,643 134,358 124,221
Selling, general and administrative expenses 36,245 40,742 74,705 85,633
Impairment of trademarks       2,036
Amortization of intangible assets 2,777 2,489 5,624 4,564
Gain on involuntary conversion   2,031   6,833
Interest income 991 978 2,060 2,001
Interest expense 127 37 270 107
Other income (expense), net 274 (3) 325 452
Income before income taxes 21,496 7,381 56,144 41,167
Income taxes 7,816 1,693 20,106 11,791
Net income $ 13,680 $ 5,688 $ 36,038 $ 29,376
Weighted average common shares outstanding:        
Basic 54,587,293 55,812,526 54,789,738 54,717,208
Diluted 54,625,747 55,930,489 54,819,877 54,819,297
Earnings per common share:        
Basic $ 0.25 $ 0.10 $ 0.66 $ 0.54
Diluted $ 0.25 $ 0.10 $ 0.66 $ 0.54
Regular dividends declared and paid per common share: $ 0.15 $ 0.10 $ 0.30 $ 0.20