Condensed Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data
 3 Months Ended 9 Months Ended
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2011
Apr. 30, 2010
Net sales $ 337,896 $ 321,887 $ 996,493 $ 936,202
Cost of products sold 170,258 161,690 505,333 471,644
Gross margin 167,638 160,197 491,160 464,558
Operating expenses:        
Research and development 10,550 10,709 32,226 30,950
Selling, general and administrative 115,006 111,227 332,394 328,638
Restructuring charge - (See Note J) 1,211 2,347 6,986 9,597
Total operating expenses 126,767 124,283 371,606 369,185
Operating income 40,871 35,914 119,554 95,373
Other income (expense):        
Investment and other income - net 1,428 121 2,892 1,273
Interest expense (5,103) (5,147) (16,640) (15,472)
Income before income taxes 37,196 30,888 105,806 81,174
Income taxes 8,607 7,193 26,737 20,810
Net income $ 28,589 $ 23,695 $ 79,069 $ 60,364
Weighted average common shares outstanding (in thousands):        
Basic 52,701 52,427 52,581 52,378
Diluted 53,337 52,873 53,067 52,971
Per Class A Nonvoting Common Share
        
Per Class Common Share:        
Basic net income $ 0.54 $ 0.45 $ 1.50 $ 1.15
Diluted net income $ 0.54 $ 0.45 $ 1.49 $ 1.14
Dividends $ 0.18 $ 0.175 $ 0.54 $ 0.525
Per Class B Voting Common Share
        
Per Class Common Share:        
Basic net income $ 0.54 $ 0.45 $ 1.48 $ 1.13
Diluted net income $ 0.54 $ 0.45 $ 1.47 $ 1.12
Dividends $ 0.18 $ 0.175 $ 0.523 $ 0.508